title: Erratum to: A cohort study of the usefulness of primary prophylaxis in patients with severe haemophilia A.
authors.affiliation: Department of Pediatrics, St. Marianna University School of Medicine, Sugao 2-16-1, Miyamae-ku, Kawasaki, Kanagawa, 216-8511, Japan. chiai-oi@marianna-u.ac.jp.
authors.forename: Chiai
authors.initials: C
authors.lastname: Nagae
authors.affiliation: Department of Pediatrics, St. Marianna University School of Medicine, Sugao 2-16-1, Miyamae-ku, Kawasaki, Kanagawa, 216-8511, Japan.
authors.forename: Atsuki
authors.initials: A
authors.lastname: Yamashita
authors.affiliation: Department of Pediatrics, St. Marianna University School of Medicine Yokohama City Seibu Hospital, Yokohama, Kanagawa, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Ashikaga
authors.affiliation: Department of Pediatrics, St. Marianna University School of Medicine, Sugao 2-16-1, Miyamae-ku, Kawasaki, Kanagawa, 216-8511, Japan.
authors.forename: Mika
authors.initials: M
authors.lastname: Mori
authors.affiliation: Department of Pediatrics, St. Marianna University School of Medicine, Sugao 2-16-1, Miyamae-ku, Kawasaki, Kanagawa, 216-8511, Japan.
authors.forename: Mieko
authors.initials: M
authors.lastname: Akita
authors.affiliation: Department of Radiology, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kitsukawa
authors.affiliation: Department of Clinical Laboratory, St. Marianna University School of Medicine Hospital, Kawasaki, Kanagawa, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamazaki
authors.affiliation: Department of Nursing, St. Marianna University School of Medicine Hospital, Kawasaki, Kanagawa, Japan.
authors.forename: Kimie
authors.initials: K
authors.lastname: Yoshikawa
authors.affiliation: Department of Pediatrics, St. Marianna University School of Medicine, Sugao 2-16-1, Miyamae-ku, Kawasaki, Kanagawa, 216-8511, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Yamamoto
authors.affiliation: Department of Pediatrics, St. Marianna University School of Medicine Yokohama City Seibu Hospital, Yokohama, Kanagawa, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Taki