“…There have been a relatively small number of studies of samples of SM or MSM participants starting at ages 14 or 16 (e.g., D'Augelli, Grossman, & Starks, 2006; Mustanski, DuBois, Prescott, & Ybarra, 2014; Mustanski, Newcomb, & Garofalo, 2011; Mustanski et al, 2010; Newcomb & Mustanski, 2013; Newcomb, Ryan, Garofalo, & Mustanski, 2014; Rosario, Hunter, & Gwadz, 1997), but even fewer that have longitudinally followed adolescents over multiple years to allow for charting of the developmental course of health issues or the identification of predictors of later health issues (e.g., Bauermeister et al, 2010; Newcomb, Heinz, Birkett, & Mustanski, 2014; Newcomb, Ryan, et al, 2014). Some large longitudinal studies of general samples of youth, such as the National Longitudinal Study of Adolescent Health (Add Health) and the Growing Up Today Study (GUTS) , have queried sexual orientation of participants as well.…”