2Department of General Internal Medicine and
Clinical Laboratory Medicine, Akita University Graduate School of
Medicine, Akita, Japan
*Correspondence
Takechiyo Yamada
Department of Otorhinolaryngology, Head and Neck Surgery, Akita
University, Graduate School of Medicine, 1-1-1 Hondo, Akita 010-8543,
Japan.
Tel.: +81-188-84-6171, Fax: +81-188-36-2622, e-mail:ymdtkcy@gmail.com