1. Rheumatology Department, Vall d’Hebron Hospital, Barcelona, Spain. mireia.lopez@vhebron.net
2. Rheumatology Research Group, Vall d’Hebron Research Institute, Barcelona, Spain.
3. Rheumatology Department, Vall d’Hebron Hospital, Barcelona, Spain.
4. Department of Clinical Biochemistry (Clinical Laboratories), Vall d’Hebron Hospital, Barcelona, Spain.