2
by Helfand, Mark
Published 2009
Oregon Health & Science University

3
by Helfand, Mark
Published 2001
Oregon Health & Science University, Evidence-Based Practice Center

4
by Helfand, Mark
Published 2005
Oregon Health & Science University, Evidence-Based Practice Center

5
by Guise, Jeanne-Marie, Mahon, Susan, Aickin, Mikel, Helfand, Mark
Published 2001
Agency for Healthcare Research and Quality (US)

7
by Helfand, Mark, Mahon, Susan, Eden, Karen B.
Published 2001
Agency for Healthcare Research and Quality (US)

8
by Helfand, Mark
Published 2001
Agency for Healthcare Research and Quality (US)

9
by Helfand, Mark
Published 2009
Oregon Health & Science University

10
by Helfand, Mark
Published 2008
Department of Veterans Affairs, Health Services Research & Development Service

11
by Chou, Roger, Helfand, Mark, Peterson, Kim, Dana, Tracy
Published 2006
Agency for Healthcare Research and Quality (US)

12
by Helfand, Mark
Published 2006
Oregon Health & Science University, Evidence-Based Practice Center

13
by Shipman, Scott, Helfand, Mark, Nygren, Peggy, Bougatsos, Christina
Published 2006
Agency for Healthcare Research and Quality (US)

14
by Chou, Roger
Published 2007
Oregon Health & Science University

15
by Nelson, Heidi D., Helfand, Mark
Published 2002
Agency for Healthcare Research and Quality (US)

16
by Nelson, Heidi D.
Published 2001
Agency for Healthcare Research and Quality (US)

17
by Helfand, Mark
Published 2007
Oregon Health & Science University

18
by Chou, Roger, Clark, Elizabeth, Helfand, Mark
Published 2004
Agency for Healthcare Research and Quality

20
by Kansagara, Devan
Published 2008
Department of Veterans Affairs, Health Services Research & Development Service