[1] Seoul Natl Univ, Coll Med, Dept Anat, Seoul 110799, South Korea
[2] Seoul Natl Univ, Coll Med, Dept Med, Seoul 110799, South Korea
[3] Univ Wisconsin Madison, Dept Biol, Madison, WI USA
[4] Seoul Natl Univ, Med Res Ctr, Inst Complementary & Integrat Med, Seoul 110799, South Korea