1. Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA.
2. Department of Infectious Diseases and Travel Medicine, MedStar Georgetown University Hospital, Washington, DC, USA.
3. Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, Michigan, USA.
4. Investigation performed at MedSport Clinic, Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, Michigan, USA