[1] Kyungpook Natl Univ, Sch Med, Prevent Med & Hlth Promot Res Ctr, Taegu 700422, South Korea
[2] Kyungpook Natl Univ, Sch Med, Dept Endocrinol, Taegu 700422, South Korea
[3] Univ Minnesota, Lab Med & Pathol, Minneapolis, MN USA
[4] Univ Minnesota, Dept Epidemiol, Sch Publ Hlth, Minneapolis, MN USA
[5] Univ Oslo, Dept Nutr, Oslo, Norway