“…Thirty‐four studies (79%) took place in Institutions in Asia, 24–28,30–35,37,39,41–52,54–56,58–62,65 7 in Europe, 36,38,40,53,57,63,64 2 in the USA 9,29 . Twenty‐one studies were prospective, 9,25,29,32–36,38,41,44,45,47,51–54,57,59,61,65 21 retrospective 24,26–28,30,31,37,39,40,42,46,48–50,55,56,58,60,62–64 and 1 cross‐sectional 43 . Three of the studies included both training and validation sets, 9,37,39 and one two cohorts of different age groups 50 .…”