Author/Authors :
umemura, akira iwate medical university - department of surgery, Morioka, Japan , takahara, takeshi iwate medical university - department of surgery, Morioka, Japan , nitta, hiroyuki iwate medical university - department of surgery, Morioka, Japan , hasegawa, yasushi iwate medical university - department of surgery, Morioka, Japan , sasaki, akira iwate medical university - department of surgery, Morioka, Japan
