Proposal for safe eradication therapy of Helicobacter pylori in patients with porphyria Tadayuki Takata, MD, PhDa,b*, Yohei Kokudo, MDc, Asahiro Morishita, MD, PhDd, Kodai Kume, MD, PhDb, Tatsuo Yachida, MD, PhDd, Masaki Kamada, MD, PhDc, Hideki Kobara, MD, PhDd, Kazushi Deguchi, MD, PhDb, Tetsuo Touge, MD, PhDe, Hisashi Masugata, MD, PhDa, Tsutomu Masaki, MD, PhDd