“…We relied on literature on human factors, patient safety, and operating theatre techniques (Barnes, 1980;Dankanich;Karwowski and Salvendy, 2010;Meyers and Stewart, 2002;Philips, 2004;Wachter, 2012) as well as on our team's ergonomics and clinical experience to select and adapt the traditional principles. In addition, we consulted related research studies on surgery (Al-Hakim, 2011;Al-Hakim and Gong, 2012;Berguer, 1999;Etchells et al, 2003;He et al, 2013;Jaschinski et al, 1998;Manasnayakorn et al, 2009;Moorthy et al, 2005;Sevdalis et al, 2007;Stifelman et al, 2001;van Det et al, 2009;van Veelen et al, 2002;Vereczkei et al, 2004;Wiegmann et al, 2007;Wong et al, 2011;Zheng et al, 2007) to develop new areas and principles for motion economy.…”