1. Clinical Laboratory, Bellvitge University Hospital, Barcelona, Spain
2. Biochemitry Service, Cruces University Hospital, Vizcaya, Spain
3. Laboratory of Clinical Biochemistry, Miguel Servet University Hospital, Zaragoza, Spain
4. Laboratory of Clinical Biochemistry, Virgen del Rocío University Hospital, Sevilla, Spain
5. Laboratory of Clinical Biochemistry, Albacete Hospital, Albacete, Spain
6. Department of Biochemistry and Molecular and Cellular Biology, University of Zaragoza, Zaragoza, Spain
7. Laboratory of Clinical Biochemistry, Gran Canaria Dr. Negrín University Hospital, Las Palmas de Gran Canaria, Spain