TABLE 5.

Studies conducted in Asia

Country/nation/region/city	Reference	Prevalence
China	Zeng Q, He Y 9	4.0%
China	Luo 10	1‐5%
Taiwan	Lee et al 11	9.6%
South Korea	Kim et al 4	3.5%
Japan	Ogawa 8	4%
Saudi Arabia	Robertson WG 3	20%
Malaysia	Current study	4%