Chondrogenic Differentiation Capacity of Human Umbilical Cord Mesenchymal Stem Cells with Platelet Rich Fibrin Scaffold in Cartilage Regeneration (In Vitro Study) - Sumarta, Ni Putu Mira; Department of Oral & Maxillofacial Surgery, Faculty of Dental Medicine, Airlangga University, Surabaya-Indonesia (BALI MEDICAL JOURNAL, 2016)