1. Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona; Laboratoris Clínics Hospital Universitari Vall d'Hebron, Barcelona
2. Laboratoris Clínics Hospital Universitari Vall d'Hebron, Barcelona
3. Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona; Servicio de Análisis Clínicos, Hospital de Motril, Granada
4. Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona; Consorci Laboratori Intercomarcal, Vilafranca del Penedés
5. Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona; Laboratorio Fundación Hospital Alcorcón, Madrid
6. Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona; Laboratori Clínic de L'Hospitalet, Barcelona
7. Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona; Laboratori Clínic Bon Pastor, Barcelona
8. Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona; Laboratori Clínic Barcelonès Nord, Barcelona
9. Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona
10. Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona; Laboratori Clínic Manso, Barcelona
11. Servei Aanàlisi Clíniques Hospital Germans Trias i Pujol, Badalona