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Article History

Received: 12 September 2017

Accepted: 18 January 2018

First Online: 13 February 2018

Compliance with ethical standards

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: Maria Bautista MD MSc has received royalties for research support from a company or supplier as a Principal researcher for Grunenthal and has received financial support for attending symposia from De Puy Synthes (Orthopedics), outside this work. Meilyn Muskus MD declares that she has no conflict of interest. Adolfo Llinás MD has received royalties from Innomed, Novamed, and 3M; has participated as paid speaker for Zimmer, Shire, Novonordisk, Novartis, Johnson & Johnson, Medtronic and Procaps; has participated as paid consultant for Zimmer and Medtronic, outside this work. Guillermo Bonilla MD has participated as paid speaker for Boehringer-Ingelheim, Pfizer, Sanofi, and DePuy Synthes (Orthopedics); has received other financial support from DePuy Synthes (Orthopedics); and has received research support from a company or supplier as a Principal researcher for Grunenthal and Johnson & Johnson, outside this work. Carlos Guerrero MD has participated as paid speaker for Grunenthal, outside this work. Jairo Moyano MD MSc declares that he has no conflict of interest.

: Internal Review Board approval was granted to this protocol before it was initiated. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.