Among the Chinese, koro is confined to South China and the lower Yangtze Valley [REF].
Sporadic cases of koro among people with non-Southeast-Asian ethnicity have been reported across the globe, for example, Nepali,[REF] Sudanese,[REF] Jordanian,[REF] Tanzanian,[REF] Nigerian,[REF] French,[REF] British,[REF][REF][REF] American[REF][REF] and Canadian [REF].