A total of 28 case (2.7%) and 56 (8.9%) control samples were excluded from analysis with >50% missing genotypes. All subsequent results are based on a total of 1563 samples (993 cases and 570 controls). Of these, 1499 (95.9%) are missing 2 or fewer genotypes (1270 samples (81.3%) missing zero, 195 (12.5%) missing one and 36 (2.3%) missing two genotypes). Higher missing data rates (3–7 genotypes) were present in 62 samples (4.0%).
