HLA-DRB1 and type 1 diabetes mellitus: Studies on the population of Bahrain reported a high frequency (70.1%) of haplotypes HLA-DRB1*03:01:01-DQB1*02:01 and HLA-DRB1*03:01:01-DQB1*03:02 in IDDM patients (Al-Jenaidi et al. 2005).