“…As with family studies, the majority of studies in this section (eleven -68.8%) reported positive associations between the SSHB of adolescents and that of their friends, with an increased likelihood of those whose friends engaged in SSHB doing so themselves, and vice versa (Alfonso & Kaur, 2012;Brent et al, 1993;Cerel, Roberts, & Nilsen, 2005;Claes, Houben, Vandereycken, Bijttebier, & Muehlenkamp, 2010;De Luca, Wyman, & Warren, 2012;Hasking, Andrews, & Martin, 2013;Ho, Leung, Hung, Lee, & Tang, 2000;Liu, 2006;Prinstein, Boergers, & Spirito, 2001;Prinstein et al, 2010;Sidhartha & Jena, 2006;You, Lin, Fu, & Leung, 2013). One study sampled clinical participants (Prinstein et al, 2010); the rest employed school/community samples.…”