Ancilla Lina. Study of the development of Immanuel Hospital children’s polyclinic service facilities on the level of customer needs and loyalty. j. Ilmu kesehat. Immanuel [Internet]. 2024 Aug. 27 [cited 2024 Oct. 6];18(1):23-35. Available from: http://ojslast.institutkesehatan-immanuel.ac.id/index.php/JIKI/article/view/253