Hiyama, T., Tanaka, S., Shima, H., Kose, K., Tuncel, H., Ito, M., Kitadai, Y., Sumii, M., Yoshihara, M., Shimamoto, F., Haruma, K., Chayama, K.,"Somatic mutation in mitochondrial DNA and nuclear microsatellite instability in gastric cancer”