1. Department of Orthopaedics, R Adams Cowley Shock Trauma CenterUniversity of Maryland School of Medicine6th Floor, Suite 300, 110 S. Paca St.Baltimore 21201Maryland
2. University of CaliforniaSan Francisco School of MedicineSan FranciscoCalifornia
3. Department of Epidemiology and Public HealthUniversity of Maryland School of MedicineBaltimoreMaryland
4. Department of MedicineUniversity of Maryland School of MedicineBaltimoreMaryland
5. Department of SurgeryMcMaster UniversityHamiltonOntario