Ossification of the posterior longitudinal ligament in three geographically and genetically different populations of ankylosing spondylitis and other spondyloarthropathies
Cesar Ramos-Remus, Anthony S Russell, Amparo Gomez-Vargas, Abel Hernandez-Chavez, Walter P Maksymowych, Jorge I Gamez-Nava, Laura Gonzalez-Lopez, Alicia García-Hernández, Esther Meoño-Morales, Ruben Burgos-Vargas, Maria E Suarez-Almazor
Annals of the Rheumatic Diseases Jul 1998, 57 (7) 429-433; DOI: 10.1136/ard.57.7.429