Routine Folic Acid and Vitamin B12 Supplementation in Hemodialysis Patients: A Cross‑Sectional Analysis of Achieved Serum Levels. Portuguese Kidney Journal, [S. l.], 2026. DOI: 10.71749/pkj.128. Disponível em: https://pkj.spnefro.pt/index.php/journal/article/view/128.. Acesso em: 3 mar. 2026.