The frequencies of risk alleles of 6 susceptibility single nucleotide polymorphism loci among different racial populations. The characters in parentheses indicate risk genotypes. The representative frequency in the United Kingdom was extracted from Di Bernardo et al28 ; the representative frequencies in Caucasians (CEU), Han people (CHB), and Japanese (JPT) were obtained from the International HapMap Project database. CEU indicates Utah residents with northern and western European ancestry from the Centre d'Etude du Polymorphisme Humain collection; CHB, Han Chinese in Beijing, China; and JPT, Japanese in Tokyo, Japan.