title: Reply.
authors.affiliation: The University of Western Ontario, London, Ontario, Canada.
authors.forename: Janet E
authors.initials: JE
authors.lastname: Pope
authors.affiliation: University of Connecticut Health Center Farmington, Connecticut.
authors.forename: Naomi F
authors.initials: NF
authors.lastname: Rothfield
authors.affiliation: Northwestern University Feinberg School of Medicine, Chicago, Illinois.
authors.forename: Rosalind
authors.initials: R
authors.lastname: Ramsey-Goldman
authors.affiliation: University of Ottawa, Ottawa, Canada.
authors.forename: C
authors.initials: C
authors.lastname: Douglas Smith
authors.affiliation: Montreal General Hospital, McGill University Health Centre, Montreal, Quebec, Canada.
authors.forename: Sasha R
authors.initials: SR
authors.lastname: Bernatsky
authors.affiliation: North Shore LIJ Health System, Great Neck, New York.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Furie
authors.affiliation: Jewish General Hospital and McGill University, Montreal, Quebec.
authors.forename: Marie
authors.initials: M
authors.lastname: Hudson
authors.affiliation: Hospital General de México Universidad Nacional Autónoma de México, Mexico City, Mexico.
authors.forename: Ruben
authors.initials: R
authors.lastname: Burgos-Vargas
authors.affiliation: Centre Hospitalier de l'Université de Montréal and University of Montreal School of Medicine, Montreal, Quebec, Canada.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Senécal
authors.affiliation: Istanbul University, Istanbul, Turkey.
authors.forename: Murat
authors.initials: M
authors.lastname: Inanç
authors.affiliation: The Karolinska Institute, Stockholm, Sweden.
authors.forename: Ronald F
authors.initials: RF
authors.lastname: van Vollenhoven
authors.affiliation: University of Toronto, University of Toronto Psoriatic Arthritis Program, Centre for Prognosis Studies in the Rheumatic Diseases, University Health Network, Toronto Western Hospital Toronto, Ontario, Canada.
authors.forename: Vinod
authors.initials: V
authors.lastname: Chandran
authors.affiliation: University of Queensland, Brisbane, Queensland, Australia.
authors.forename: Peter T
authors.initials: PT
authors.lastname: Nash
authors.affiliation: Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: Chayawee
authors.initials: C
authors.lastname: Muangchan