Received: 30 October 2017
Accepted: 12 April 2018
First Online: 27 April 2018
Ethics approval and consent to participate
: The study was performed according to the guidelines of the Helsinki Declaration and was approved by the Research Ethics Boards of University of São Paulo (CAPpesq #30396314.3.0000.0068). All patients gave written informed consent before study entry.
: The authors declare that they have no competing interests.
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