Assessing colonoscopic inspection skill using a virtual withdrawal simulation: a preliminary validation of performance metrics by Christine M. Zupanc, Guy M. Wallis, Andrew Hill, Robin Burgess-Limerick, Stephan Riek, Annaliese M. Plooy, Mark S. Horswill, Marcus O. Watson, Hans de Visser, David Conlan, David G. Hewett

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