“…Thirteen studies 31 -43 investigated endoscopic procedures, including colonoscopy 36,40,43 , oesophogastroduodenoscopy 32,38,39,41 , cystourethroscopy 37 , flexible transnasal laryngoscopy 31,35 , endoscopic sinus surgery 33,42 and transurethral resection of prostate (TURP) 34 ( Table 2). Seven studies 44 -50 investigated other procedures, namely knee arthroscopy 46 , abdominal fascial closure 49 , cardiac catheterization 44 , superficial femoral artery angioplasty 47 and cataract surgery 45,48,50 (Table 3).…”