Perhaps it's a sign that they're suffering disproportionately negative symptoms. South Korea appears to have startling high Vitamin D deficiency rates; that may

Perhaps it's a sign that they're suffering disproportionately negative symptoms. South Korea appears to have startling high Vitamin D deficiency rates; that may be part of the problem (if other studies are to be believed). https://journals.lww.com/md-journal/Fulltext/2018/06290/Vitamin_D_status_in_South_Korean_population_.5.aspx https://journals.lww.com/md-journal/Fulltext/2018/06290/Vita...