1. Johns Hopkins School of Medicine, Department of Anesthesiology & Critical Care Medicine, Division of Pain Medicine, 600 North Wolfe Street, Osler 292, Baltimore, MD 21287, USA and Johns Hopkins Carey School of Business, 100 International Drive, Baltimore, MD 21202, USA.
2. Royal Brisbane & Women’s Hospital, Brisbane, Queensland, Australia
3. DePaul University, Department of Management, Chicago, IL, USA