Studi In Vitro Efek Ekstrak Etanol Gambir (Uncaria gambir (Hunter) Roxb.) terhadap Ekspresi Sitoglobin, Elastin, dan Desmosin pada Fibroblas Keloid = In Vitro Study on The Effect of Ethanol Extract of Gambir (Uncaria gambir (Hunter) Roxb.) on The Expression of Cytoglobin, Elastin, and Desmosine in Keloid Fibroblast