Reply to 'The potential and perils of observational studies' by M. Buyse et al.
Department of Medical Oncology, Gustave Roussy, Villejuif, France.
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S
Delaloge
Department of Biostatistics, Centre Léon Bérard, Lyon, France.
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D
Pérol
R&D Unicancer, Paris, France.
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M
Robain
R&D Unicancer, Paris, France.
C
C
Cailliot