title: RETRACTED ARTICLE: Safety and effectiveness of high-dose methotrexate (over 8 mg/week) in 2838 Japanese patients with rheumatoid arthritis: A postmarketing surveillance report.
authors.affiliation: Division of Rheumatology, Department of Internal Medicine, Tokai University School of Medicine, Kanagawa, Japan.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Suzuki
authors.affiliation: Medical Affairs, Pfizer Japan Inc., Tokyo, Japan.
authors.forename: Naonobu
authors.initials: N
authors.lastname: Sugiyama
authors.affiliation: Medical Affairs, Pfizer Japan Inc., Tokyo, Japan.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Fukuma
authors.affiliation: Development Japan, Pfizer Japan Inc., Tokyo, Japan.
authors.forename: Noriko
authors.initials: N
authors.lastname: Sugiyama
authors.affiliation: Development Japan, Pfizer Japan Inc., Tokyo, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kokubo