the survey were first led through a consent process that further explained the study and their participation. Individuals who completed the online survey were also eligible to provide a deoxyribonucleic acid (DNA) sample. The current analyses are based on students who matriculated in the Fall of 2011 (n = 2714), 2012 (n = 2486), and 2013 (n = 2403), for a total of n = 7603. Of these, 98% provided a DNA sample.
