Pathak Neha, Dodds Julie, Zamora Javier, Khan Khalid
Women's Health Research Unit, Centre for Primary Care and Public Health, Blizard Institute, Barts and the London School of Medicine and Dentistry, London E1 2AB, UK.
Women's Health Research Unit, Centre for Primary Care and Public Health, Blizard Institute, Barts and the London School of Medicine and Dentistry, London E1 2AB, UK Clinical Biostatistics Unit, Hospital Ramon y Cajal (IRYCIS) and CIBER Epidemiologia y Salud Publica, Madrid, Spain
BMJ. 2014 Oct 15;349:g6253. doi: 10.1136/bmj.g6253.