21
by Niessen, Louis W.
Published 2012
Agency for Healthcare Research and Quality, U.S. Department of Health and Human Services

22
by Frick, Kevin
Published 2012
Agency for Healthcare Research and Quality, U.S. Department of Health and Human Services

23
Published 2012
National Academies Press

27
by Gerstein, Dean R.
Published 1990
National Academy Press

28
Published 2012
National Academies Press

29
by Packham, Karen
Published 2010
Royal College of Obstetricians and Gynaecologists

30
by Crimmins, Eileen M.
Published 2011
National Academies Press

31
by Olson, Steve
Published 2011
National Academies Press

34
Published 2004
National Academies Press

35
by Ver Ploeg, Michele
Published 2004
The National Academies Press

37
Published 2011
Canadian Agency for Drugs and Technologies in Health

38
Published 1984
National Academy Press

40
Published 1988
National Academy Press