“…The search yielded two randomized controlled trials [24,28], eight non-randomized controlled studies [25-27, 29, 30, 33, 34, 36] and three single-centre descriptive studies [31,32,35]. Studies were performed in the United States [24,26,27,35], United Kingdom [30,32,34], Netherlands [25,33], Sweden [31], Denmark [29], Canada [36] and Ireland [28]. Twelve studies focused on patients from surgical specialties, including orthopaedic [26,28,30,32,35], thoracic [29,33], urologic [27,36], ophthalmic [31], rhinoplastic [25] and general surgery [34].…”