“…First, in most studies, peers were defined as either "the best friend" or a group of friends. Studies that relied on the best friend (Bot, et al, 2005;Branstetter, et al, 2011;De Kemp, Scholte, Overbeek, & Engels, 2006;Henry, Kobus, & Schoeny, 2011;Jackson, 1997;Larsen, et al, 2010;Rees & Pogarsky, 2010;Sieving, et al, 2000) did so because it was hypothesized that this friend usually shared a more intense and intimate relationship with the target and thus had a stronger influence (Rybak & McAndrew, 2006). However, there was little evidence supporting this hypothesis, with only a few studies showing that best friends had a strong influence on adolescents' alcohol use (Jackson, 1997;Urberg, et al, 1997), whereas other studies found only trivial or no effects (Bot, et al, 2005;Jaccard, et al, 2005;Larsen, et al, 2010).…”