D. N. Pratiwi and S. Sumiati, “Optimizing Healthcare Service Efficiency Through Lean Healthcare and Root Cause Analysis: Meningkatkan Efisiensi Layanan Kesehatan Melalui Lean Healthcare dan Analisis Penyebab Utama”, acopen, vol. 10, no. 2, p. 10.21070/acopen.10.2025.11570, Oct. 2025.