Optimal form of operationalizing BMI in relation to all-cause and cause-specific mortality: the original Whitehall study.
Kivimäki M, Ferrie JE, Batty GD, Davey Smith G, Elovainio M, Marmot MG, Shipley MJ. Optimal form of operationalizing BMI in relation to all-cause and cause-specific mortality: the original Whitehall study. Obesity (Silver Spring). 2008 Aug; 16(8):1926-32.