1 Department of Orthopedics and Rehabilitation, University of Iowa Hospitals and Clinics, IA, USA; Department of Orthopedics, Tokushima University, Tokushima, Japan. Electronic address: kazutayamasita0311@hotmail.com.
2 Department of Orthopedics and Rehabilitation, University of Iowa Hospitals and Clinics, IA, USA; Enrico and Enrica Sovena Foundation, Rome, Italy. Electronic address: cosma.calderaro@gmail.com.
3 Department of Orthopedics and Rehabilitation, University of Iowa Hospitals and Clinics, IA, USA; Enrico and Enrica Sovena Foundation, Rome, Italy. Electronic address: lucaroma@libero.it.
4 Department of Orthopedics and Rehabilitation, University of Iowa Hospitals and Clinics, IA, USA. Electronic address: pawin26@gmail.com.
5 Department of Orthopedics and Rehabilitation, University of Iowa Hospitals and Clinics, IA, USA. Electronic address: stuart-weinstein@uiowa.edu.