“…Three of the studies were cross-sectional (Decker et al, 2012; Jones et al, 2006; Magnusson et al, 2011), two were prospective (Abrams, 1985; Upadhyay, Brown, Sokoloff, & Raine, 2012), one involved a retrospective chart review (Shlay, Zolot, Bell, Maravi, & Urbina, 2009), and one involved a pseudo cohort extracted from a randomized controlled trial by ignoring randomization (Cremer et al, 2011). …”