title: Erratum to: Analysis of Programmed Death-1 in Patients with Psoriatic Arthritis.
authors.affiliation: The Department of Medicine, New York University School of Medicine, 450 E 29th Street, New York, NY, 10016, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: Peled
authors.forename: Marianne
authors.initials: M
authors.lastname: Strazza
authors.forename: Inbar
authors.initials: I
authors.lastname: Azoulay-Alfaguter
authors.forename: Gregg J
authors.initials: GJ
authors.lastname: Silverman
authors.forename: Jose U
authors.initials: JU
authors.lastname: Scher
authors.forename: Adam
authors.initials: A
authors.lastname: Mor