Received: 17 November 2017
Accepted: 15 February 2018
First Online: 27 February 2018
Ethics approval and consent to participate
: The protocol conforms to the ethical guidelines of the declaration of Helsinki and it was approved by the local ethics committee – Comissão de Ética para a Saúde do Hospital de São João. All patients provided written informed consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.
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