1. National Institute of Science and Technology for Health Technology Assessment (IATS) - CNPq/Brazil (project: 465518/2014-1), Porto Alegre, RS, Brazil; School of Technology, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil; Postgraduate Program in Epidemiology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
2. Department of Surgery, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
3. Department of Surgery, Division of Hepatobiliary & Pancreas Surgery, Carolinas Medical Center, Atrium Health, Charlotte, NC, USA
4. Harvard University, Harvard Business School, Boston, MA, USA
5. National Institute of Science and Technology for Health Technology Assessment (IATS) - CNPq/Brazil (project: 465518/2014-1), Porto Alegre, RS, Brazil; Postgraduate Program in Epidemiology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
6. Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA