[1] Faculty of Medicine,Section for Clinical Epidemiology and Biostatistics
[2] Ramathibodi Hospital,Division of Neurology, Department of Medicine
[3] Mahidol University,Centre for Clinical Epidemiology and Biostatistics
[4] Faculty of Medicine,undefined
[5] Ramathibodi Hospital,undefined
[6] Mahidol University,undefined
[7] The University of Newcastle,undefined
[8] Hunter Medical Research Institute,undefined
[9] and Department of General Medicine,undefined
[10] John Hunter Hospital,undefined