Impact Analysis of the Tiered Referral System Implementation on Outpatient Visit Reduction at Dr. Ferdinand Lumban Tobing Hospital, Sibolga. JURNAL KESMAS DAN GIZI (JKG), [S. l.], v. 8, n. 2, p. 1364–1370, 2026. DOI: 10.35451/aykm3z30. Disponível em: https://ejournal.medistra.ac.id/index.php/JKG/article/view/3525. Acesso em: 26 apr. 2026.