Long-term follow up of patients with small gastrointestinal stromal tumors in the stomach using endoscopic ultrasonography-guided fine-needle aspiration biopsy

Akira Sawaki, Nobumasa Mizuno, Kuniyuki Takahashi, Tsuneya Nakamura, Masahiro Tajika, Hiroki Kawai, Toshifumi Isaka, Hiroshi Imaoka, Yasuyuki Okamoto, Masatoshi Aoki, Hiroyuki Inoue, Ahmed As Salem, Yasushi Yatabe, Kenji Yamao