title: Reply.
authors: University of Pittsburgh School of Medicine. Pittsburgh, PA.
authors: Robyn T
authors: RT
authors: Domsic
authors: University of Pittsburgh School of Medicine. Pittsburgh, PA.
authors: Mary
authors: M
authors: Lucas
authors: University College London Medical School, Royal Free Hospital, London, UK.
authors: Svetlana I
authors: SI
authors: Nihtyanova
authors: University College London Medical School, Royal Free Hospital, London, UK.
authors: Christopher P
authors: CP
authors: Denton
authors: University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA.
authors: Stephen R
authors: SR
authors: Wisniewski
authors: Veterans Affairs Center for Health Equity, Research and Promotion, Veterans Affairs Pittsburgh Healthcare, Pittsburgh, PA.
authors: Michael J
authors: MJ
authors: Fine
authors: University of Arizona Arthritis Center, Tucson, AZ.
authors: C Kent
authors: CK
authors: Kwoh
authors: University of Pittsburgh School of Medicine, Pittsburgh, PA.
authors: Thomas A
authors: TA
authors: Medsger