Mucosal concentrations of N-acetyl-5-aminosalicylic acid related to endoscopic activity in ulcerative colitis patients with mesalamine

Tomohiro Fukuda, Makoto Naganuma, Kaoru Takabayashi, Yuya Hagihara, Shun Tanemoto, Ena Nomura, Yusuke Yoshimatsu, Shinya Sugimoto, Kosaku Nanki, Shinta Mizuno, Yohei Mikami, Kayoko Fukuhara, Tomohisa Sujino, Makoto Mutaguchi, Nagamu Inoue, Haruhiko Ogata, Yasushi Iwao, Takayuki Abe, Takanori Kanai