Incidence of IBD in Hong Kong: 19802014 30fold increase in three decades HK IBD RegistryIncidence of IBD in Hong Kong: 19802014 30fold increase in three decades HK IBD RegistryIncidence of IBD in Hong Kong: 19802014 30fold increase in three decades HK IBD RegistryIncidence of IBD in Hong Kong: 19802014 30fold increase in three decades HK IBD Registry