“Some people might say, ‘What an old boys’ network,’ But I thought, ‘My goodness, what a homogeneous population, akin to identical white mice, which thereby controls for all sorts of differences.’ ”
-- Dr. Donald A. Redelmeier, on his 2004 paper comparing medical school class presidents to a control group of others in the class and found that "survival after medical school was 2.4 years shorter for presidents than their classmates". From: Death rates of medical school class presidents. Redelmeier DA, Kwong JC. Soc Sci Med. 2004 Jun;58(12):2537-43.