Non‐surgical pneumoperitoneum associated with mechanical ventilation. Issue 4 (26th June 2014) - Okamoto, Ayana; Nakao, Atsunori; Matsuda, Kenichi; Yamada, Taihei; Osako, Takaaki; Sakata, Hiroyuki; Yamaguchi, Yoshimichi; Terashima, Mariko; Iwano, Jinka; Kotani, Joji