1. UCIBIO, REQUIMTE, Laboratory of Biochemistry, Department of Biological Sciences, Faculty of Pharmacy, University of Porto, Porto, Portugal;
2. CESPU, Institute of Research and Advanced Training in Health Sciences and Technologies (IINFACTS), Gandra-Paredes, Portugal;
3. Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal;
4. Hemodialysis Clinic of Felgueiras, CHF, Felgueiras, Portugal;
5. Hemodialysis Clinic of Porto, CHP, Porto, Portugal;
6. Center for Health Technology and Services Research (CINTESIS), Faculty of Medicine, University of Porto, Porto, Portugal;
7. NefroServe Hemodialysis Clinic of Barcelos, Barcelos, Portugal;
8. NefroServe Hemodialysis Clinic of Viana do Castelo, Viana do Castelo, Portugal;
9. Hemodialysis Clinic of Gondomar, CHD, Gondomar, Portugal