Published on in Vol 6 , No 11 (2017) :November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/8343, first published
.

1 Department of Orthopedics and Traumatology, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
*these authors contributed equally