1. Department of DermatologyPerelman School of Medicine University of Pennsylvania, Philadelphia Pennsylvania
2. Podiatric Surgery and MedicinePenn Presbyterian Medical CenterPhiladelphia Pennsylvania
3. Department of MedicineGreater Baltimore Medical CenterBaltimore Maryland
4. Department of Biostatistics, Epidemiology, and InformaticsUniversity of PennsylvaniaPhiladelphia Pennsylvania
5. Department of Emergency MedicineUniversity of Maryland School of MedicineBaltimore Maryland