title: Authors' reply.
authors.affiliation: a Department of Rheumatology , Tel Aviv Sourasky Medical Center , Tel Aviv , Israel.|b Sackler Faculty of Medicine , Tel Aviv University , Tel Aviv , Israel.
authors.forename: V
authors.initials: V
authors.lastname: Furer
authors.affiliation: c Rheumatology Unit Carmel Medical Center, Rappoport Faculty of Medicine , Haifa , Israel.
authors.forename: D
authors.initials: D
authors.lastname: Zisman
authors.affiliation: d Rheumatology Unit , Rabin Medical Center, Beilinson Hospital , Petach Tikva , Israel.
authors.forename: E
authors.initials: E
authors.lastname: Pokroy-Shapira
authors.affiliation: b Sackler Faculty of Medicine , Tel Aviv University , Tel Aviv , Israel.|d Rheumatology Unit , Rabin Medical Center, Beilinson Hospital , Petach Tikva , Israel.
authors.forename: Y
authors.initials: Y
authors.lastname: Molad
authors.affiliation: a Department of Rheumatology , Tel Aviv Sourasky Medical Center , Tel Aviv , Israel.|b Sackler Faculty of Medicine , Tel Aviv University , Tel Aviv , Israel.
authors.forename: O
authors.initials: O
authors.lastname: Elkayam
authors.affiliation: a Department of Rheumatology , Tel Aviv Sourasky Medical Center , Tel Aviv , Israel.|b Sackler Faculty of Medicine , Tel Aviv University , Tel Aviv , Israel.
authors.forename: D
authors.initials: D
authors.lastname: Paran