- Correspondence to Dr Alfonso Ragnar Torres Jimenez, Department of Pediatric Rheumatology, National Medical Center La Raza, IMSS, Vallejo y Jacarandas, colonia La Raza, Azcapotzalco, D.F. Mexico CP. 02990, Mexico;
- Accepted 19 June 2017
- Published in print 5 September 2017.
- Published online 6 September 2017.
- Published first 2 August 2017.
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