Effects of audio and visual distraction on patients’ vital signs and tolerance during esophagogastroduodenoscopy: a randomized controlled trial oleh Masahiro Sogabe, Toshiya Okahisa, Akira Fukuya, Kaizo Kagemoto, Yasuyuki Okada, Yuka Adachi, Takeshi Kurihara, Toru Nii, Satoshi Teramae, Hironori Tanaka, Tetsu Tomonari, Koichi Okamoto, Hiroshi Miyamoto, Masahiko Nakasono, Tetsuji Takayama