“…Medical students were the novices for three studies involving camera navigation 28 and transnasal flexible endoscopy 31,35 . Six 20,31,33,34,36,38 of the 27 RCTs did not report the method of randomization, and only three 21,23,27 reported clearly how the randomization process, including sequence generation, allocation concealment and implementation, occurred. Power calculation was reported by 15 RCTs 21,25,27 -32,34,36,37,41,43,44,49 .…”