“…The sample sizes ranged from 10 [ 43 ] to 283 [ 37 ]. All studies were conducted at university hospitals or clinical research centres in America [ 42 , 43 , 46 , 51 , 52 ], Australia [ 35 ], Egypt [ 49 ], Hong Kong [ 33 ], Iran [ 32 , 40 , 44 , 47 , 48 , 50 , 54 ], Italy [ 31 , 34 , 36 – 38 ], Turkey [ 53 ], United Kingdom [ 39 ] and Venezuela [ 41 , 45 ].…”