By Marion Cooper, Great Britain: Ministry of Agriculture, Fisheries and Food, Anthony W. Johnson
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By Medical Economics
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By David Machin, M. Campbell, P Fayers, APY Pinol
By David Machin, etc., M. J. Campbell
By David Plotz
By David M. Murray (Professor of Epidemiology, Professor of Epidemiology, University of Minnesota School of Public Health, USA)
By Dr J Andre Knottnerus (University of Maastricht, The Netherlands Netherlands)
By H.R. Wulff, Peter C. Gotzsche
By Richard K. Rondel, Sheila Varley, Colin F. Webb
By Alejandro R. Jadad
By C. Phillips
By Britt Wray
By Emma Cannon
By HF Grundy
By J. Michael Dixon
By Humphrey P. Rang
By Sarah Wilson
By Jack R. Cooper, Floyd E. Bloom, Robert H. Roth, PhD
By J Griffin
By Andrew Wilcock, Paul Howard, Sarah Charlesworth
By Byron Katie, Stephen Mitchell
By Alan Stevens, Alan Stevens MBBS FRCPath, James S. Lowe BMedSci BMBS DM FRCPath
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By Helen Chapel, Mansel Haeney, S. Misbah, N. Snowden
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By Susan F. Murray