1. Birmingham VA Medical Center; Department of Medicine; Faculty Office Tower 805B 510 20th Street South Birmingham USA AL 35294
2. Mayo Clinic School of Medicine; Orthopaedic Surgery; Rochester MN USA
3. Department of Epidemiology and Preventive Medicine, Monash University; Monash Department of Clinical Epidemiology at Cabrini Hospital; Suite 41, Cabrini Medical Centre 183 Wattletree Road Malvern Victoria Australia 3144
4. Minneapolis VA Medical Center and University of Minnesota; Medicine; One Veterans Drive Minneapolis Minnesota USA 55417