1. Department of Orthopaedic Surgery; The University of Iowa Hospitals & Clinics; Iowa City IA USA
2. Department of Epidemiology, College of Public Health; The University of Iowa; Iowa City IA USA
3. Department of Health and Human Physiology; The University of Iowa; Iowa City IA USA
4. Department of Preventive & Community Dentistry; The University of Iowa College of Dentistry & Dental Clinics; Iowa City IA USA
5. Department of Internal Medicine; The University of Iowa Hospitals & Clinics; Iowa City IA USA