“…Eight of these articles, including one systematic review (Karjalainen et al 2003a), were selected during the electronic literature search (Arnetz et al 2003;Haldorsen et al 1998Haldorsen et al , 2002Johansson et al 1998;Lofvander 1999;Marhold et al 2001;NordstromBjorverud and Moritz 1998;Skouen et al 2002). Two articles were found as a result of the reference check (Linton et al 1997;Lofvander et al 1997), and 16 articles were primary studies retrieved during systematic reviews of Guzman et al (2001), Karjalainen et al (2003b) and Schonstein et al (2003) (Alaranta et al 1994;Altmaier et al 1992;Bendix et al 1995Bendix et al , 1996Bendix et al , 1997Bentsen et al 1997;Corey et al 1996;Faas et al 1995;Kellett et al 1991;Lindstrom et al 1992aLindstrom et al , b, 1995Loisel et al 1997;Mitchell and Carmen 1994;Moffett et al 1999;Torstensen et al 1998).…”