title: Opponent's comments.
authors.affiliation: Vasculitis and Lupus Clinic, Addenbrooke's Hospital, Cambridge CB2 0QQ, UK.
authors.forename: Andreas
authors.initials: A
authors.lastname: Kronbichler
authors.affiliation: Vasculitis and Lupus Clinic, Addenbrooke's Hospital, Cambridge CB2 0QQ, UK.
authors.forename: David R W
authors.initials: DR
authors.lastname: Jayne