Design of process evaluation within the Child and Adolescent Trial for Cardiovascular Health (CATCH).
McGraw SA, Stone EJ, Osganian SK, Elder JP, Perry CL, Johnson CC, Parcel GS, Webber LS, Luepker RV. Design of process evaluation within the Child and Adolescent Trial for Cardiovascular Health (CATCH). Health Educ Q. 1994; Suppl 2:S5-26.