“…Among the 47 included studies, 23(48.9%) studies focused on patients with generalized HF (7, 13, 17-31), while the rest 24 studies focused on patients with specific categories of HF, among which 19 studies (40.4%) focused on patients with HFpEF (32-50), and the other 5 studies (14, 51-54) (10.6%) focused on HFrEF. Of these studies, only one In all the included studies, the corresponding authors were from 13 different countries, including the United States (22, 46.8%) (18-22, 24, 26-28, 33, 36, 37, 40, 41, 44, 48, 53, 54, 56-59), the Netherlands (5, 10.6%) (23, 45, 47, 55, 60), France (5, 10.6%) (13, 17, 32, 43, 51), Spain (3, 6.4%) (25,34,38), China (3, 6.4%) (7,35,49) and Japan (2, 4.3%) (31). Australia (52), Germany (30), Italy (14), Poland (39), Switzerland (46), Canada (50) and the United Kingdom ( 29) each had only one study (1, 2.1%).…”