[1] Edgbaston,The University of Birmingham
[2] University of Amsterdam,Academic Medical Center
[3] Department of Obstetrics and Gynaecology,Academic Medical Center
[4] University of Amsterdam,Clinical Biostatistics Unit
[5] Department of Clinical Epidemiology and Biostatistics,Birmingham Women's Hospital
[6] Hospital Ramon y Cajal,Heart of England NHS Foundation Trust
[7] Ctra Colmenar,Department of Paediatrics
[8] Metchley Park Road,TUDOR
[9] Solihull Hospital,undefined
[10] Agency for Quality in Medicine,undefined
[11] University of Pécs,undefined
[12] University of Szeged,undefined
[13] Albert Szent-Gyorgyi Medical and Pharmacological Centre,undefined
[14] CASPe (CASP Espana),undefined
[15] CASPolska,undefined
[16] Universitá Cattolica del Sacro Cuore,undefined
[17] Basel Institute for Clinical Epidemiology,undefined
[18] CIBER Epidemiologia y Salud Publica (CIBERESP),undefined