Searching other resources
Bibliographies of each included RCT as well as any review article
or texts found were searched for additional relevant papers that
may contain further RCTs.
Authors of included RCTs were contacted for other published and
unpublished studies.All authors responded (Emtner 2003;Garrod
2000; Rooyackers 1997; Wadell 2001) except (Fichter 1999).