1. Research Unit in Clinical Epidemiology, Specialties Hospital of the National Occidental Medical Centre, Mexican Social Security Institute (IMSS), Guadalajara, Jalisco, Mexico
2. University Centre of Health Sciences, University of Guadalajara, Guadalajara, Jalisco, Mexico
3. Department of Epidemiology, Familiar Medicine Unit 4-8, IMSS and University Centre of Health Sciences, University of Guadalajara, Guadalajara, Jalisco, Mexico
4. Research Centre of Arthritis and Osteoporosis, Mexicali, Baja California, Mexico
5. Department of Internal Medicine-Rheumatology, Hospital General Regional 45, IMSS, Guadalajara, Jalisco, Mexico
6. Faculty of Medicine, University of Juárez del Estado de Durango, Gómez Palacio, Durango, Mexico
7. University Centre of Tonala, University of Guadalajara, Tonala, Jalisco, Mexico
8. Research Institute of Rheumatology and Skeletal Muscle System, University Centre of Health Sciences, University of Guadalajara, Guadalajara, Jalisco, Mexico
9. Division of Health Research, Hospital of the National Occidental Medical Centre, IMSS, Guadalajara, Jalisco, Mexico
10. Postdoctoral Fellow Research Program of Postgraduate in Medical Sciences University of Colima, Colima Mexico and LIDF, CUCEL University of Guadalajara, Guadalajara, Mexico
11. Department of Anaesthesiology, Specialties Hospital of the Western National Medical Centre, IMSS, Guadalajara, Jalisco, Mexico
12. Department of Physiology, University Centre of Health Sciences, University of Guadalajara, Guadalajara, Jalisco, Mexico
13. Department of Internal Medicine-Rheumatology, Hospital General Regional 110, IMSS, Guadalajara, Jalisco, Mexico and CUCS University of Guadalajara, Guadalajara, Jalisco, Mexico