- Correspondence to Dr João Xavier, Serviço de Anestesiologia — Departamento de Anestesiologia Cuidados Intensivos e Emergencia, Centro Hospitalar e Universitário do Porto, Porto, Portugal;
- Received October 8, 2019
- Revision received January 28, 2020
- Accepted February 2, 2020
- First published February 23, 2020.
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