- Correspondence to Dr Maurizio Cereda, Department of Anesthesiology and Critical Care, Perelman School of Medicine at the University of Pennsylvania, Dulles 773, 3400 Spruce Street, Philadelphia, PA 19104-4283, USA;
- Received 7 December 2016
- Revised 13 April 2017
- Accepted 1 May 2017
- Published online 20 June 2017.
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