1. Report characteristics of relevant studies.
| Study ID | Country of Origin | Language of Report | Type of Report | Contact Author | Reply | Assessment |
| Belsky 1994 | USA | English | Journal article | Yes | No | awaiting |
| Bingham 2010 | USA | English | Journal article | No | No | exclude |
| Bryon 2000 | UK | English | Abstract | Yes | No | awaiting |
| Cannon 1999 | USA | English | Abstract | Yes | No | awaiting |
| Castellani 2011 | Italy | English | Journal article | No | No | exclude |
| Chernoff 2002 | USA | English | Journal article | No | NA | include |
| Christian 1999 | USA | English | Abstract | Yes | No | awaiting |
| Christian 2006 | USA | English | Journal article | No | No | include |
| Cummings 2011 | Australia | English | Journal article | No | No | awaiting |
| Davis 1990 | USA | English | Abstract | Yes | No | awaiting |
| Delk 1994 | USA | English | Journal article | Yes | No | include |
| Dodd 2001 | Ireland | English | Abstract | Yes | Yes | exclude |
| Georgiopoulus 2011 | USA | English | Journal article | No | No | exclude |
| Goodill 2005 | USA | English | Journal article | Yes | No | awaiting |
| Goldbeck 2011 | Germany | English | Journal article | No | No | exclude |
| Grasso 2000 | Australia | English | Journal article | Yes | Yes | include |
| Hatziagorou 2010 | Greece | English | Abstract | Yes | Yes | awaiting |
| Hernandez‐Reif 1999 | USA | English | Journal article | Yes | Yes | include |
| Jessup 2010 | Australia | English | Abstract | Yes | Yes | awaiting |
| Jessup 2011 | Australia | English | Abstract | Yes | Yes | awaiting |
| Kalnins 1996 | USA | English | Abstract | Yes | No | awaiting |
| Klig 1989 | USA | English | Abstract | Yes | Yes | awaiting |
| Marciel 2010 | USA | English | Journal Article / Summary of clinical trial registration |
Yes | Yes | ongoing |
| Mischler 1998 | USA | English | Journal article | No | No | awaiting |
| Patel 2010 | UK | English | Abstract | Yes | Yes | exclude |
| Petzel 1991 | USA | English | Abstract | Yes | No | awaiting |
| Pop Jordanova 2010 | Macedonia | English | Journal Article | No | No | exclude |
| Powers 2003 | USA | English | Journal article | Yes | Yes | include |
| Powers 2005 | USA | English | Journal article | No | NA | include |
| Quinn 2004 | UK | English | Abstract | Yes | Yes | include |
| Quittner 2000 | USA | English | Book chapter | Yes | Yes | awaiting |
| Quittner 2002 | USA | English | Personal correspondence | Yes | Yes | awaiting |
| Quittner 2011 | USA | English | Abstract | Yes | Yes | ongoing |
| Ralston 2008 | USA | English | Journal article | Yes | No | exclude |
| Ranström 2000 | France | English | Journal article | Yes | No | exclude |
| Riekert 2012 | USA | English | Summary of clinical trials registration | No | No | ongoing |
| Rodrigue 2005 | USA | English | Journal Article | No | No | exclude |
| Stark 1996 | USA | English | Journal article | Yes | Yes | include |
| Stark 1998 | USA | English | Abstract | Yes | Yes | awaiting |
| Stark 2001 | USA | English | Unpublished report | Yes | Yes | include |
| Stark 2002 | USA | English | Journal Article | No | No | exclude |
| Stark 2003 | USA | English | Journal article | No | NA | include |
| Stark 2009 | USA | English | Journal article | Yes | Yes | include |
| Taylor 2003 | USA | English | Journal Article | Yes | Yes | include |
| Vandemheen 2009 | Australia / Canada | English | Journal article | Yes | Yes | awaiting |
| Wainwright 2009 | Australia | English | Abstract | Yes | Yes | awaiting |
| Wilkinson 2008 | UK | English | Journal article | Yes | No | awaiting |
| Williams 1997 | UK | English | Abstract | Yes | Yes | awaiting |
| Wolter 1997 | Australia | English | Journal article | Yes | Yes | exclude |