[1] Hosp Univ Marques Valdecilla, Rheumatol, Santander, Spain
[2] Hosp Univ Marques Valdecilla, Nephrol, Santander, Spain
[3] Hosp Univ Marques Valdecilla, Pediat, Santander, Spain
[4] Hosp Univ Marques Valdecilla, Pathol, Santander, Spain
[5] Hosp Univ Marques Valdecilla, Dermatol, Santander, Spain