[1] SUNY Buffalo, Dept Med, Buffalo, NY 14260 USA
[2] SUNY Buffalo, Dept Family Med, Buffalo, NY 14260 USA
[3] McMaster Univ, Dept Clin Epidemiol & Biostat, Hamilton, ON, Canada
[4] McMaster Univ, Dept Med, Hamilton, ON, Canada
[5] McMaster Univ, Dept Oncol, Hamilton, ON, Canada
[6] Regina Elena Inst Canc Res, Dept Dev Therapeut Programs, Rome, Italy
[7] Regina Elena Inst Canc Res, Expt Res Ctr, Rome, Italy
[8] Regina Elena Inst Canc Res, Dept Expt Oncol, Rome, Italy
[9] Regina Elena Inst Canc Res, Sci Directorate, Rome, Italy
[10] Univ Med Ctr Freiburg, German Cochrane Ctr, Inst Biostat & Med Informat, Freiburg, Germany
[11] Univ Med Ctr Freiburg, Pediat Hematol & Oncol Clin, Ctr Pediat & Adolescent Med, Freiburg, Germany