作者单位:Department of Surgical Sciences, Orthopaedics, Uppsala UniversityUppsala, Sweden[1]London School of Hygiene and Tropical MedicineLondon, United Kingdom, Medical Products[2]Centre for Health Equity Studies (CHESS), Stockholm University, Karolinska InstitutetStockholm[3]Department of Public Health and Caring Sciences, Geriatrics, Uppsala UniversityUppsala, Sweden[4]