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1:Arabic
1:Chinese
48:English
2:English (inferred by country)
2:English Australian
1:Finnish
1:Flemish
2:French
1:German
1:Greek
1:Italian
1:Japanese (inferred by country)
1:Mandarin
2:Norwegian (inferred by country)
1:Portuguese
1:Spanish
1:Thai
2:Turkish

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2:Australia
1:Belgium
1:Brazil
11:Canada
2:China
1:Finland
2:France
1:Germany
1:Greece
1:Italy
1:Japan
2:Norway
1:Saudi Arabia
1:Spain
1:Thailand
2:Turkey
39:United States

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3:blank
1:Beijing
2:Besancon
3:California
1:Canada/ Ohio
1:Colorado
1:Connecticut
2:Florida
1:Georgia
2:MACS Centers
1:Maine
1:Maryland
1:Maryland, Pennsylvania
1:Melbourne
1:Missouri
1:New York
1:North Dakota
31:Not indicated by study
3:Oklahoma
1:Oklahoma, Ohio
1:Pennsylvania
1:Portland, Oregon
1:Rhode Island
1:S. California
1:Texas
1:Virginia
1:Washington
1:Washington, Colorado, California
3:Wisconsin

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12:blank
1:Australian
6:Canadian
1:Diverse
50:Not indicated by study

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1:1970
1:1977
4:1980
1:1981
1:1983
1:1985
7:1987
2:1988
1:1990
1:1991
1:1992
1:1993
3:1995
2:1996
1:1997
6:1998
4:1999
5:2000
2:2001
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2:2003
3:2004
3:2007
2:2008
1:2009
3:2010
2:2011
1:2012
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70:Journal Article