“…Among articles on incidence, there were 21 (51.2%) articles for Europe, 9,14,15,20,21,24,32–37,41–44,48–50,54,58 12(30.8%) for Asia, 12,13,17,31,39,40,45,47,51–53,57 3(10.3%) for North America, 30,38,46 and 2 for Africa 55,56,58 . With regard to prevalence‐related articles, there were 12 (48%) articles for Asia, 57,59,60,62,63,65,68–72,75 7(28%) for Europe, 14,22,54,58,64,66,73 3(12%) for Africa, 23,55,56 and 1(4%) for South Africa, 67 North America, 74 and Oceania, 61 respectively. Nineteen 23,54–56,59–72 (76%) studies used clinic‐based data, and 6 14,22,57,58,73,74 (24%) used population‐based data.…”