“…Study characteristics are presented in Table 1. One study was published in 1981 (30), one study in the late 1990s (31), 14 studies between 2000 and 2009 (15,18,19,21,(32)(33)(34)(35)(36)(37)(38)(39)(40)(41) and 17 studies between 2010 and April 2016 (1,8,9,16,17,20,(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52). Study settings included the following: USA (32), Canada (37), Australia (36,46,49), Sweden (15,16,19,(29)(30)(31)33,38,40,41,47,49), Norway (20,35,…”