“…(2009);Blagden et al (2014);Condon et al (2007);Decorte (2007);Giertsen, Nylander, Frank, Kolind, and Tourunen (2015);Kenning et al (2010);Topp et al (2016);Tzvetkova et al (2016); andWoodall (2010) Random or quasi-random 6Cobb and Farrants (2014); DeHart(2008); Einat (2009); Fogel et al (2014); Rahmah et al (2014); and Topp et al (2016) Unclear 7 Recruitment strategies (excluding self-response to advertisement) Researcher presented to group (including meetings for other purposes) 8 Aday, Krabill, and Deaton-Owens (2014); Harawa et al (2010); Harner and Riley (2013); Lewin and Farkas (2012); Saraiva et al (2011); Staton-Tindall et al (2007); and Woodall, Dixey, Green, and Newell (2009) Individual invitation by researchers (including researchers in dual roles) 22 Alves et al (2016); A. N. Chambers (2009); Earle (2011); Fogel et al (2014); Gilham (2012); Haley et al (2014); Howerton et al (2007); Kennedy (2014); Khaw et al (2007); Mjaland (2015); Pedlar, Yuen, and Fortune (2008); Plugge et al (2008); Reading and Bowen (2014); Schneider and Feltey (2009); and Treloar, McCredie, and Lloyd (2016) Health-care provider invitation/facilitation 16 Baker et al (2013); Carlson et al (2011); Castro Madariaga, Gó mez Garcés, Carrasco Parra, and Foster (2017); Einat and Rabinovitz (2013); Elisha, Idisis, and Ronel (2012); Guin (2009); Hassan et al (2013); Havnes et al (2014); Lee et al (2006); Mangnall and Yurkovich (2010); Ritter and Elger (2013); Soffer and Ajzenstadt (2010); and Yap et al (2014) Prison program leader/worker invitation 7 Billington et al (2016); Borrill et al (2005); Kerley and Copes (2009); O'Grady et al (2015); and Sondhi et al (2016) Prison staff invitation/facilitation 11 Decorte (2007); Harner and Riley (2013); Havnes et al (2014); Muessig et al (2016); Oliver and Hairston (2008); Ralphs et al (2017); Todrys and Amon (2011); Tzvetkova et al (2016); Yap et al (2014); and Zamani et al , Martell, Pyne, and Keenan (2016); Hatton et al (2006); Howerton et al (2007); Lewin and Farkas (2012); and Smirnova and Owens (2017) Refreshments/cosmetics/clothes 5 Fogel et al (2014); Oliver and Hairston (2008); Plugge et al (2008); Schonberg et al (2015); and Zamani et al (2016); Alves et al (2016); Enders et al (2005); Facchin and Margola (2016); and Harner et al (2011) Not stated 84…”