2
by Chou, Roger, Helfand, Mark, Peterson, Kim, Dana, Tracy
Published 2006
Agency for Healthcare Research and Quality (US)

3
by Chou, Roger, Clark, Elizabeth, Helfand, Mark
Published 2004
Agency for Healthcare Research and Quality

4
by Helfand, Mark
Published 2004
Agency for Healthcare Research and Quality (US)

5
by Chou, Roger, Clark, Elizabeth, Helfand, Mark
Published 2004
Agency for Healthcare Research and Quality

6
by Helfand, Mark
Published 2004
Agency for Healthcare Research and Quality (US)

8
by Chou, Roger, Helfand, Mark, Peterson, Kim, Dana, Tracy
Published 2006
Agency for Healthcare Research and Quality (US)

9
by Helfand, Mark
Published 2009
Agency for Healthcare Research and Quality