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Ralph Weissleder, Ph.D., M.D.

Co-Author

This page shows the publications co-authored by Ralph Weissleder and Peter Libby.
Connection Strength

4.689
  1. Libby P, DiCarli M, Weissleder R. The vascular biology of atherosclerosis and imaging targets. J Nucl Med. 2010 May 01; 51 Suppl 1:33S-37S.
    View in: PubMed
    Score: 0.479
  2. Libby P, Nahrendorf M, Weissleder R. Molecular imaging of atherosclerosis: a progress report. Tex Heart Inst J. 2010; 37(3):324-7.
    View in: PubMed
    Score: 0.470
  3. King KR, Aguirre AD, Ye YX, Sun Y, Roh JD, Ng RP, Kohler RH, Arlauckas SP, Iwamoto Y, Savol A, Sadreyev RI, Kelly M, Fitzgibbons TP, Fitzgerald KA, Mitchison T, Libby P, Nahrendorf M, Weissleder R. IRF3 and type I interferons fuel a fatal response to myocardial infarction. Nat Med. 2017 Dec; 23(12):1481-1487.
    View in: PubMed
    Score: 0.202
  4. King K, Grazette LP, Paltoo DN, McDevitt JT, Sia SK, Barrett PM, Apple FS, Gurbel PA, Weissleder R, Leeds H, Iturriaga EJ, Rao A, Adhikari B, Desvigne-Nickens P, Galis ZS, Libby P. Point-of-Care Technologies for Precision Cardiovascular Care and Clinical Research: National Heart, Lung, and Blood Institute Working Group. JACC Basic Transl Sci. 2016 Jan-Feb; 1(1-2):73-86.
    View in: PubMed
    Score: 0.178
  5. Konishi M, Erdem SS, Weissleder R, Lichtman AH, McCarthy JR, Libby P. Imaging Granzyme B Activity Assesses Immune-Mediated Myocarditis. Circ Res. 2015 Aug 28; 117(6):502-512.
    View in: PubMed
    Score: 0.173
  6. Taqueti VR, Di Carli MF, Jerosch-Herold M, Sukhova GK, Murthy VL, Folco EJ, Kwong RY, Ozaki CK, Belkin M, Nahrendorf M, Weissleder R, Libby P. Increased microvascularization and vessel permeability associate with active inflammation in human atheromata. Circ Cardiovasc Imaging. 2014 Nov; 7(6):920-9.
    View in: PubMed
    Score: 0.162
  7. Buxton DB, Antman M, Danthi N, Dilsizian V, Fayad ZA, Garcia MJ, Jaff MR, Klimas M, Libby P, Nahrendorf M, Sinusas AJ, Wickline SA, Wu JC, Bonow RO, Weissleder R. Report of the National Heart, Lung, and Blood Institute working group on the translation of cardiovascular molecular imaging. Circulation. 2011 May 17; 123(19):2157-63.
    View in: PubMed
    Score: 0.129
  8. Quillard T, Croce K, Jaffer FA, Weissleder R, Libby P. Molecular imaging of macrophage protease activity in cardiovascular inflammation in vivo. Thromb Haemost. 2011 May; 105(5):828-36.
    View in: PubMed
    Score: 0.126
  9. Nahrendorf M, Keliher E, Panizzi P, Zhang H, Hembrador S, Figueiredo JL, Aikawa E, Kelly K, Libby P, Weissleder R. 18F-4V for PET-CT imaging of VCAM-1 expression in atherosclerosis. JACC Cardiovasc Imaging. 2009 Oct; 2(10):1213-22.
    View in: PubMed
    Score: 0.115
  10. Jaffer FA, Libby P, Weissleder R. Optical and multimodality molecular imaging: insights into atherosclerosis. Arterioscler Thromb Vasc Biol. 2009 Jul; 29(7):1017-24.
    View in: PubMed
    Score: 0.112
  11. Christen T, Nahrendorf M, Wildgruber M, Swirski FK, Aikawa E, Waterman P, Shimizu K, Weissleder R, Libby P. Molecular imaging of innate immune cell function in transplant rejection. Circulation. 2009 Apr 14; 119(14):1925-32.
    View in: PubMed
    Score: 0.111
  12. Aikawa E, Aikawa M, Libby P, Figueiredo JL, Rusanescu G, Iwamoto Y, Fukuda D, Kohler RH, Shi GP, Jaffer FA, Weissleder R. Arterial and aortic valve calcification abolished by elastolytic cathepsin S deficiency in chronic renal disease. Circulation. 2009 Apr 07; 119(13):1785-94.
    View in: PubMed
    Score: 0.111
  13. Jaffer FA, Vinegoni C, John MC, Aikawa E, Gold HK, Finn AV, Ntziachristos V, Libby P, Weissleder R. Real-time catheter molecular sensing of inflammation in proteolytically active atherosclerosis. Circulation. 2008 Oct 28; 118(18):1802-9.
    View in: PubMed
    Score: 0.108
  14. Nahrendorf M, Sosnovik D, Chen JW, Panizzi P, Figueiredo JL, Aikawa E, Libby P, Swirski FK, Weissleder R. Activatable magnetic resonance imaging agent reports myeloperoxidase activity in healing infarcts and noninvasively detects the antiinflammatory effects of atorvastatin on ischemia-reperfusion injury. Circulation. 2008 Mar 04; 117(9):1153-60.
    View in: PubMed
    Score: 0.103
  15. Kircher MF, Grimm J, Swirski FK, Libby P, Gerszten RE, Allport JR, Weissleder R. Noninvasive in vivo imaging of monocyte trafficking to atherosclerotic lesions. Circulation. 2008 Jan 22; 117(3):388-95.
    View in: PubMed
    Score: 0.102
  16. Nahrendorf M, Zhang H, Hembrador S, Panizzi P, Sosnovik DE, Aikawa E, Libby P, Swirski FK, Weissleder R. Nanoparticle PET-CT imaging of macrophages in inflammatory atherosclerosis. Circulation. 2008 Jan 22; 117(3):379-87.
    View in: PubMed
    Score: 0.102
  17. Shepherd J, Hilderbrand SA, Waterman P, Heinecke JW, Weissleder R, Libby P. A fluorescent probe for the detection of myeloperoxidase activity in atherosclerosis-associated macrophages. Chem Biol. 2007 Nov; 14(11):1221-31.
    View in: PubMed
    Score: 0.101
  18. Jaffer FA, Libby P, Weissleder R. Molecular imaging of cardiovascular disease. Circulation. 2007 Aug 28; 116(9):1052-61.
    View in: PubMed
    Score: 0.100
  19. Jaffer FA, Kim DE, Quinti L, Tung CH, Aikawa E, Pande AN, Kohler RH, Shi GP, Libby P, Weissleder R. Optical visualization of cathepsin K activity in atherosclerosis with a novel, protease-activatable fluorescence sensor. Circulation. 2007 May 01; 115(17):2292-8.
    View in: PubMed
    Score: 0.097
  20. Nahrendorf M, Jaffer FA, Kelly KA, Sosnovik DE, Aikawa E, Libby P, Weissleder R. Noninvasive vascular cell adhesion molecule-1 imaging identifies inflammatory activation of cells in atherosclerosis. Circulation. 2006 Oct 03; 114(14):1504-11.
    View in: PubMed
    Score: 0.094
  21. Deguchi JO, Aikawa M, Tung CH, Aikawa E, Kim DE, Ntziachristos V, Weissleder R, Libby P. Inflammation in atherosclerosis: visualizing matrix metalloproteinase action in macrophages in vivo. Circulation. 2006 Jul 04; 114(1):55-62.
    View in: PubMed
    Score: 0.092
  22. Swirski FK, Pittet MJ, Kircher MF, Aikawa E, Jaffer FA, Libby P, Weissleder R. Monocyte accumulation in mouse atherogenesis is progressive and proportional to extent of disease. Proc Natl Acad Sci U S A. 2006 Jul 05; 103(27):10340-10345.
    View in: PubMed
    Score: 0.092
  23. Jaffer FA, Libby P, Weissleder R. Molecular and cellular imaging of atherosclerosis: emerging applications. J Am Coll Cardiol. 2006 Apr 04; 47(7):1328-38.
    View in: PubMed
    Score: 0.090
  24. Hoyer FF, Naxerova K, Schloss MJ, Hulsmans M, Nair AV, Dutta P, Calcagno DM, Herisson F, Anzai A, Sun Y, Wojtkiewicz G, Rohde D, Frodermann V, Vandoorne K, Courties G, Iwamoto Y, Garris CS, Williams DL, Breton S, Brown D, Whalen M, Libby P, Pittet MJ, King KR, Weissleder R, Swirski FK, Nahrendorf M. Tissue-Specific Macrophage Responses to Remote Injury Impact the Outcome of Subsequent Local Immune Challenge. Immunity. 2019 11 19; 51(5):899-914.e7.
    View in: PubMed
    Score: 0.058
  25. He S, Kahles F, Rattik S, Nairz M, McAlpine CS, Anzai A, Selgrade D, Fenn AM, Chan CT, Mindur JE, Valet C, Poller WC, Halle L, Rotllan N, Iwamoto Y, Wojtkiewicz GR, Weissleder R, Libby P, Fernández-Hernando C, Drucker DJ, Nahrendorf M, Swirski FK. Gut intraepithelial T cells calibrate metabolism and accelerate cardiovascular disease. Nature. 2019 02; 566(7742):115-119.
    View in: PubMed
    Score: 0.055
  26. Anzai A, Choi JL, He S, Fenn AM, Nairz M, Rattik S, McAlpine CS, Mindur JE, Chan CT, Iwamoto Y, Tricot B, Wojtkiewicz GR, Weissleder R, Libby P, Nahrendorf M, Stone JR, Becher B, Swirski FK. The infarcted myocardium solicits GM-CSF for the detrimental oversupply of inflammatory leukocytes. J Exp Med. 2017 Nov 06; 214(11):3293-3310.
    View in: PubMed
    Score: 0.050
  27. Hulsmans M, Clauss S, Xiao L, Aguirre AD, King KR, Hanley A, Hucker WJ, Wülfers EM, Seemann G, Courties G, Iwamoto Y, Sun Y, Savol AJ, Sager HB, Lavine KJ, Fishbein GA, Capen DE, Da Silva N, Miquerol L, Wakimoto H, Seidman CE, Seidman JG, Sadreyev RI, Naxerova K, Mitchell RN, Brown D, Libby P, Weissleder R, Swirski FK, Kohl P, Vinegoni C, Milan DJ, Ellinor PT, Nahrendorf M. Macrophages Facilitate Electrical Conduction in the Heart. Cell. 2017 04 20; 169(3):510-522.e20.
    View in: PubMed
    Score: 0.049
  28. Sager HB, Hulsmans M, Lavine KJ, Moreira MB, Heidt T, Courties G, Sun Y, Iwamoto Y, Tricot B, Khan OF, Dahlman JE, Borodovsky A, Fitzgerald K, Anderson DG, Weissleder R, Libby P, Swirski FK, Nahrendorf M. Proliferation and Recruitment Contribute to Myocardial Macrophage Expansion in Chronic Heart Failure. Circ Res. 2016 Sep 16; 119(7):853-64.
    View in: PubMed
    Score: 0.046
  29. Sager HB, Dutta P, Dahlman JE, Hulsmans M, Courties G, Sun Y, Heidt T, Vinegoni C, Borodovsky A, Fitzgerald K, Wojtkiewicz GR, Iwamoto Y, Tricot B, Khan OF, Kauffman KJ, Xing Y, Shaw TE, Libby P, Langer R, Weissleder R, Swirski FK, Anderson DG, Nahrendorf M. RNAi targeting multiple cell adhesion molecules reduces immune cell recruitment and vascular inflammation after myocardial infarction. Sci Transl Med. 2016 06 08; 8(342):342ra80.
    View in: PubMed
    Score: 0.046
  30. Ye YX, Calcagno C, Binderup T, Courties G, Keliher EJ, Wojtkiewicz GR, Iwamoto Y, Tang J, Pérez-Medina C, Mani V, Ishino S, Johnbeck CB, Knigge U, Fayad ZA, Libby P, Weissleder R, Tawakol A, Dubey S, Belanger AP, Di Carli MF, Swirski FK, Kjaer A, Mulder WJ, Nahrendorf M. Imaging Macrophage and Hematopoietic Progenitor Proliferation in Atherosclerosis. Circ Res. 2015 Oct 23; 117(10):835-45.
    View in: PubMed
    Score: 0.044
  31. Sager HB, Heidt T, Hulsmans M, Dutta P, Courties G, Sebas M, Wojtkiewicz GR, Tricot B, Iwamoto Y, Sun Y, Weissleder R, Libby P, Swirski FK, Nahrendorf M. Targeting Interleukin-1ß Reduces Leukocyte Production After Acute Myocardial Infarction. Circulation. 2015 Nov 17; 132(20):1880-90.
    View in: PubMed
    Score: 0.044
  32. He S, Chousterman BG, Fenn A, Anzai A, Nairz M, Brandt M, Hilgendorf I, Sun Y, Ye YX, Iwamoto Y, Tricot B, Weissleder R, Macphee C, Libby P, Nahrendorf M, Swirski FK. Lp-PLA2 Antagonizes Left Ventricular Healing After Myocardial Infarction by Impairing the Appearance of Reparative Macrophages. Circ Heart Fail. 2015 Sep; 8(5):980-7.
    View in: PubMed
    Score: 0.043
  33. Dutta P, Sager HB, Stengel KR, Naxerova K, Courties G, Saez B, Silberstein L, Heidt T, Sebas M, Sun Y, Wojtkiewicz G, Feruglio PF, King K, Baker JN, van der Laan AM, Borodovsky A, Fitzgerald K, Hulsmans M, Hoyer F, Iwamoto Y, Vinegoni C, Brown D, Di Carli M, Libby P, Hiebert SW, Scadden DT, Swirski FK, Weissleder R, Nahrendorf M. Myocardial Infarction Activates CCR2(+) Hematopoietic Stem and Progenitor Cells. Cell Stem Cell. 2015 May 07; 16(5):477-87.
    View in: PubMed
    Score: 0.043
  34. Dutta P, Hoyer FF, Grigoryeva LS, Sager HB, Leuschner F, Courties G, Borodovsky A, Novobrantseva T, Ruda VM, Fitzgerald K, Iwamoto Y, Wojtkiewicz G, Sun Y, Da Silva N, Libby P, Anderson DG, Swirski FK, Weissleder R, Nahrendorf M. Macrophages retain hematopoietic stem cells in the spleen via VCAM-1. J Exp Med. 2015 Apr 06; 212(4):497-512.
    View in: PubMed
    Score: 0.042
  35. Kessinger CW, Kim JW, Henke PK, Thompson B, McCarthy JR, Hara T, Sillesen M, Margey RJ, Libby P, Weissleder R, Lin CP, Jaffer FA. Statins improve the resolution of established murine venous thrombosis: reductions in thrombus burden and vein wall scarring. PLoS One. 2015; 10(2):e0116621.
    View in: PubMed
    Score: 0.042
  36. Heidt T, Sager HB, Courties G, Dutta P, Iwamoto Y, Zaltsman A, von Zur Muhlen C, Bode C, Fricchione GL, Denninger J, Lin CP, Vinegoni C, Libby P, Swirski FK, Weissleder R, Nahrendorf M. Chronic variable stress activates hematopoietic stem cells. Nat Med. 2014 Jul; 20(7):754-758.
    View in: PubMed
    Score: 0.040
  37. Leuschner F, Courties G, Dutta P, Mortensen LJ, Gorbatov R, Sena B, Novobrantseva TI, Borodovsky A, Fitzgerald K, Koteliansky V, Iwamoto Y, Bohlender M, Meyer S, Lasitschka F, Meder B, Katus HA, Lin C, Libby P, Swirski FK, Anderson DG, Weissleder R, Nahrendorf M. Silencing of CCR2 in myocarditis. Eur Heart J. 2015 Jun 14; 36(23):1478-88.
    View in: PubMed
    Score: 0.040
  38. Hilgendorf I, Gerhardt LM, Tan TC, Winter C, Holderried TA, Chousterman BG, Iwamoto Y, Liao R, Zirlik A, Scherer-Crosbie M, Hedrick CC, Libby P, Nahrendorf M, Weissleder R, Swirski FK. Ly-6Chigh monocytes depend on Nr4a1 to balance both inflammatory and reparative phases in the infarcted myocardium. Circ Res. 2014 May 09; 114(10):1611-22.
    View in: PubMed
    Score: 0.039
  39. Hilgendorf I, Theurl I, Gerhardt LM, Robbins CS, Weber GF, Gonen A, Iwamoto Y, Degousee N, Holderried TA, Winter C, Zirlik A, Lin HY, Sukhova GK, Butany J, Rubin BB, Witztum JL, Libby P, Nahrendorf M, Weissleder R, Swirski FK. Innate response activator B cells aggravate atherosclerosis by stimulating T helper-1 adaptive immunity. Circulation. 2014 Apr 22; 129(16):1677-87.
    View in: PubMed
    Score: 0.039
  40. Courties G, Heidt T, Sebas M, Iwamoto Y, Jeon D, Truelove J, Tricot B, Wojtkiewicz G, Dutta P, Sager HB, Borodovsky A, Novobrantseva T, Klebanov B, Fitzgerald K, Anderson DG, Libby P, Swirski FK, Weissleder R, Nahrendorf M. In vivo silencing of the transcription factor IRF5 reprograms the macrophage phenotype and improves infarct healing. J Am Coll Cardiol. 2014 Apr 22; 63(15):1556-66.
    View in: PubMed
    Score: 0.039
  41. Robbins CS, Hilgendorf I, Weber GF, Theurl I, Iwamoto Y, Figueiredo JL, Gorbatov R, Sukhova GK, Gerhardt LM, Smyth D, Zavitz CC, Shikatani EA, Parsons M, van Rooijen N, Lin HY, Husain M, Libby P, Nahrendorf M, Weissleder R, Swirski FK. Local proliferation dominates lesional macrophage accumulation in atherosclerosis. Nat Med. 2013 Sep; 19(9):1166-72.
    View in: PubMed
    Score: 0.038
  42. Ueno T, Dutta P, Keliher E, Leuschner F, Majmudar M, Marinelli B, Iwamoto Y, Figueiredo JL, Christen T, Swirski FK, Libby P, Weissleder R, Nahrendorf M. Nanoparticle PET-CT detects rejection and immunomodulation in cardiac allografts. Circ Cardiovasc Imaging. 2013 Jul; 6(4):568-73.
    View in: PubMed
    Score: 0.037
  43. Majmudar MD, Yoo J, Keliher EJ, Truelove JJ, Iwamoto Y, Sena B, Dutta P, Borodovsky A, Fitzgerald K, Di Carli MF, Libby P, Anderson DG, Swirski FK, Weissleder R, Nahrendorf M. Polymeric nanoparticle PET/MR imaging allows macrophage detection in atherosclerotic plaques. Circ Res. 2013 Mar 01; 112(5):755-61.
    View in: PubMed
    Score: 0.036
  44. Dutta P, Courties G, Wei Y, Leuschner F, Gorbatov R, Robbins CS, Iwamoto Y, Thompson B, Carlson AL, Heidt T, Majmudar MD, Lasitschka F, Etzrodt M, Waterman P, Waring MT, Chicoine AT, van der Laan AM, Niessen HW, Piek JJ, Rubin BB, Butany J, Stone JR, Katus HA, Murphy SA, Morrow DA, Sabatine MS, Vinegoni C, Moskowitz MA, Pittet MJ, Libby P, Lin CP, Swirski FK, Weissleder R, Nahrendorf M. Myocardial infarction accelerates atherosclerosis. Nature. 2012 Jul 19; 487(7407):325-9.
    View in: PubMed
    Score: 0.035
  45. Leuschner F, Rauch PJ, Ueno T, Gorbatov R, Marinelli B, Lee WW, Dutta P, Wei Y, Robbins C, Iwamoto Y, Sena B, Chudnovskiy A, Panizzi P, Keliher E, Higgins JM, Libby P, Moskowitz MA, Pittet MJ, Swirski FK, Weissleder R, Nahrendorf M. Rapid monocyte kinetics in acute myocardial infarction are sustained by extramedullary monocytopoiesis. J Exp Med. 2012 Jan 16; 209(1):123-37.
    View in: PubMed
    Score: 0.034
  46. Robbins CS, Chudnovskiy A, Rauch PJ, Figueiredo JL, Iwamoto Y, Gorbatov R, Etzrodt M, Weber GF, Ueno T, van Rooijen N, Mulligan-Kehoe MJ, Libby P, Nahrendorf M, Pittet MJ, Weissleder R, Swirski FK. Extramedullary hematopoiesis generates Ly-6C(high) monocytes that infiltrate atherosclerotic lesions. Circulation. 2012 Jan 17; 125(2):364-74.
    View in: PubMed
    Score: 0.034
  47. Leuschner F, Dutta P, Gorbatov R, Novobrantseva TI, Donahoe JS, Courties G, Lee KM, Kim JI, Markmann JF, Marinelli B, Panizzi P, Lee WW, Iwamoto Y, Milstein S, Epstein-Barash H, Cantley W, Wong J, Cortez-Retamozo V, Newton A, Love K, Libby P, Pittet MJ, Swirski FK, Koteliansky V, Langer R, Weissleder R, Anderson DG, Nahrendorf M. Therapeutic siRNA silencing in inflammatory monocytes in mice. Nat Biotechnol. 2011 Oct 09; 29(11):1005-10.
    View in: PubMed
    Score: 0.033
  48. Jaffer FA, Calfon MA, Rosenthal A, Mallas G, Razansky RN, Mauskapf A, Weissleder R, Libby P, Ntziachristos V. Two-dimensional intravascular near-infrared fluorescence molecular imaging of inflammation in atherosclerosis and stent-induced vascular injury. J Am Coll Cardiol. 2011 Jun 21; 57(25):2516-26.
    View in: PubMed
    Score: 0.033
  49. Vinegoni C, Botnaru I, Aikawa E, Calfon MA, Iwamoto Y, Folco EJ, Ntziachristos V, Weissleder R, Libby P, Jaffer FA. Indocyanine green enables near-infrared fluorescence imaging of lipid-rich, inflamed atherosclerotic plaques. Sci Transl Med. 2011 May 25; 3(84):84ra45.
    View in: PubMed
    Score: 0.032
  50. Morishige K, Kacher DF, Libby P, Josephson L, Ganz P, Weissleder R, Aikawa M. High-resolution magnetic resonance imaging enhanced with superparamagnetic nanoparticles measures macrophage burden in atherosclerosis. Circulation. 2010 Oct 26; 122(17):1707-15.
    View in: PubMed
    Score: 0.031
  51. Panizzi P, Swirski FK, Figueiredo JL, Waterman P, Sosnovik DE, Aikawa E, Libby P, Pittet M, Weissleder R, Nahrendorf M. Impaired infarct healing in atherosclerotic mice with Ly-6C(hi) monocytosis. J Am Coll Cardiol. 2010 Apr 13; 55(15):1629-38.
    View in: PubMed
    Score: 0.030
  52. Swirski FK, Nahrendorf M, Etzrodt M, Wildgruber M, Cortez-Retamozo V, Panizzi P, Figueiredo JL, Kohler RH, Chudnovskiy A, Waterman P, Aikawa E, Mempel TR, Libby P, Weissleder R, Pittet MJ. Identification of splenic reservoir monocytes and their deployment to inflammatory sites. Science. 2009 Jul 31; 325(5940):612-6.
    View in: PubMed
    Score: 0.029
  53. Wildgruber M, Lee H, Chudnovskiy A, Yoon TJ, Etzrodt M, Pittet MJ, Nahrendorf M, Croce K, Libby P, Weissleder R, Swirski FK. Monocyte subset dynamics in human atherosclerosis can be profiled with magnetic nano-sensors. PLoS One. 2009 May 22; 4(5):e5663.
    View in: PubMed
    Score: 0.028
  54. Nahrendorf M, Swirski FK, Aikawa E, Stangenberg L, Wurdinger T, Figueiredo JL, Libby P, Weissleder R, Pittet MJ. The healing myocardium sequentially mobilizes two monocyte subsets with divergent and complementary functions. J Exp Med. 2007 Nov 26; 204(12):3037-47.
    View in: PubMed
    Score: 0.025
  55. Swirski FK, Libby P, Aikawa E, Alcaide P, Luscinskas FW, Weissleder R, Pittet MJ. Ly-6Chi monocytes dominate hypercholesterolemia-associated monocytosis and give rise to macrophages in atheromata. J Clin Invest. 2007 Jan; 117(1):195-205.
    View in: PubMed
    Score: 0.024
Connection Strength
The connection strength for co-authors is the sum of the scores for each of their shared publications.

Publication scores are based on many factors, including how long ago they were written and whether the person is a first or senior author.
Funded by the NIH National Center for Advancing Translational Sciences through its Clinical and Translational Science Awards Program, grant number UL1TR002541.