According to a study for united kingdom populationhe mean prevalence of HA (all severities) for our research database was 6.7±0.1 (per 100000 males). Similar results were obtained in Japan (5.9±0.5), Korea (5.3±0.4), and Hong Kong (6.4), all of which were slightly lower than that reported in Singapore (7.8±0.2). Our results demonstrated a lower prevalence that those reported in the Netherlands (11.7), Italy (10.0), United Kingdom (21.4), Canada (14.3), and the United States (10.5). The mean prevalence of HB (all severities) was 1.2±0.1 (per 100000 males). Similar results were also obtained in Japan (1.3±0.1)23 and Singapore (1.1±0.1), which were slightly higher than the results reported for Korea (1.0±0.2), all of which were lower than the results for Italy (2.0), the United Kingdom (4.5),and Canada (3.3).