Does site investigator belong under the Ad Hoc/Site Visit category? Private: Questions & Answers › Category: U-CV System › Does site investigator belong under the Ad Hoc/Site Visit category? 0 Vote Up Vote Down u6001240 asked 7 years ago Site investigator, Canadian Biliary Atresia Registry (CBAR), Canadian Pediatric Hepatology Research Group 1 Answers 0 Vote Up Vote Down u6001240 answered 7 years ago Yes, it does.