1. Multimorbidity: prevalence, effect on quality of life and daily functioning, and variation of this effect when one condition is a rheumatic disease;Loza;Semin Arthritis Rheum.,2009
2. Burden of major musculoskeletal conditions;Woolf;Bull World Health Org.,2003
3. The burden of musculoskeletal diseases in the general population of Spain: results from a national survey;Carmona;Ann Rheum Dis.,2001
4. Community based study to estimate prevalence, burden of illness and help seeking behavior in rheumatic diseases in Mexico City. A COPCORD study;Cardiel;Clin Exp Rheumatol.,2002
5. Prevalence of rheumatic diseases in Brazil: a study using the COPCORD approach;Rodríguez-Senna;J Rheumatol.,2004