Luis Furuya-Kanamori1, Suhail A R Doi2. 1. Clinical Epidemiology Unit, School of Population Health, The University of Queensland, Herston Road, Herston, QLD 4006, Australia. 2. Clinical Epidemiology Unit, School of Population Health, The University of Queensland, Herston Road, Herston, QLD 4006, Australia. Electronic address: sardoi@gmx.net.