[1] Univ Oxford, Dept Publ Hlth & Primary Care, Ctr Evidence Based Med, Oxford OX3 7LF, England
[2] James Lind Initiat, Oxford OX2 7LG, England
[3] Ctr Stat Med, Oxford OX2 6UD, England
[4] German Inst Qual & Efficiency Hlth Care, Cologne, Germany
[5] Univ Paris, INSERM, F-75252 Paris, France
[6] Norwegian Knowledge Ctr Hlth Serv, Oslo, Norway
[7] WHO, Dept Res Policy & Cooperat, Geneva, Switzerland
[8] La Trobe Univ, Australian Inst Primary Care, Ctr Hlth Commun & Participat, Bundoora, Vic 3086, Australia
[9] UCL, Div Psychol & Language Sci, London WC1E 7HB, England
[10] Univ E Anglia, Fac Hlth, Hlth & Social Sci Res Inst, Norwich NR4 7TJ, Norfolk, England
[11] Univ So Calif, Div Biokinesiol & Phys Therapy, Los Angeles, CA USA
[12] Duke Univ, Duke Evidence Based Practice Ctr, Durham, NC USA
[13] Durham VA Med Ctr, Durham, NC USA