Rothman Kenneth J, Gallacher John E J, Hatch Elizabeth E
RTI Health Solutions, RTI International, Research Triangle Park, NC, USA, Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA, and Institute of Primary Care and Public Health, Cardiff University, Cardiff, UK.
Int J Epidemiol. 2013 Aug;42(4):1026-8. doi: 10.1093/ije/dyt124.