ISOlation Procedure vs. conventional procedure during Distal Pancreatectomy (ISOP-DP trial): study protocol for a randomized controlled trial oleh Ken-ichi Okada, Manabu Kawai, Seiko Hirono, Masayuki Sho, Masaji Tani, Ippei Matsumoto, Suguru Yamada, Ryosuke Amano, Hirochika Toyama, Yo-ichi Yamashita, Takeshi Gocho, Kazuto Shibuya, Minako Nagai, Hiromitsu Maehira, Keiko Kamei, Go Ohira, Yoshihiro Shirai, Hideki Takami, Nana Kimura, Takumi Fukumoto, Hideo Baba, Yasuhiro Kodera, Akimasa Nakao, Toshio Shimokawa, Masahiro Katsuda, Hiroki Yamaue