“…Out of 36 studies that were considered, 12 4,5,9,10,13,15,17,21,22,26,29,32 met the inclusion criteria. The above articles represent eleven case-series studies 4,5,9,10,13,15,17,21,26,29,32 and 1 case-control study 22 that can be classified as C and B level of evidence according to the U.K National Health Service system.…”