Carlos Julio Aponte, MD, board-certified rheumatologist and American School of Rheumatology member.

David Borenstein, MD, scientific professor of drugs, George Washington College Medical Heart; companion, Arthritis and Rheumatism Associates, Washington, DC; government editor,

UpToDate: “Prognosis and differential analysis of axial spondyloarthritis (ankylosing spondylitis and nonradiographic axial spondyloarthritis) in adults,” “Pathogenesis of spondyloarthritis.”

Nationwide Well being Service (U.Okay.): “Ankylosing spondylitis.”

Spondylitis Affiliation of America: “Prognosis of Ankylosing Spondylitis.”

Johns Hopkins Arthritis Heart: “Ankylosing Spondylitis.”

Present Rheumatology Studies: “Gender Variations in Axial Spondyloarthritis: Ladies Are Not So Fortunate.”

Stanford Healthcare: “How is Ankylosing Spondylitis identified?”