1. Department of Orthopaedics and Rehabilitation, Orthopaedic Biomechanics Laboratory; University of Iowa; 2181 Westlawn Iowa City Iowa 52242-1100
2. Department of Orthopaedic Surgery; Thammasat University; Pathumthani Thailand
3. Department of Orthopaedics; Dokkyo Medical University Koshigaya Hospital; Koshigaya Saitama Japan
4. Department of Biomedical Engineering; University of Iowa; Iowa City Iowa
5. Indiana University Health Orthopaedics and Sports Medicine; Indianapolis Indiana