“…Most studies, however, were conducted using 5-year [14, 29, 30, 43, 47, 48] or 10-year intervals [16, 19, 20, 32, 39, 42, 44]. The most frequently used data collection method was medical records review (n = 16) [13, 19, 22, 31–34, 37–40, 42, 44–46, 48], followed by ALS registries (n = 11) [14, 16–18, 20, 21, 23, 27, 30, 35, 49], surveys (n = 5) [15, 17, 18, 21, 25, 27–30, 43, 45, 47], and databases (n = 5) [24, 26, 36, 41, 47]. Most of the studies that used the medical records review approach were retrospective (81%); by contrast, most of the studies using ALS registries were prospective (70%).…”