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1
00001648-199207000-00009
00001648-199207000-00009
http://dx.doi.org/10.1097/00001648-199207000-00009
Ethics, scientific validity, and the design of epidemiologic studies.
P356
Q36354124-B9AA7D3F-976D-44AF-9BA6-82E7A08811E3
P356
00001648-199207000-00009
http://dx.doi.org/10.1097/00001648-199207000-00009