Pengaruh fotokoagulasi laser terhadap hypoxia inducible factor-1? hif-1? dan intercellular adhesive molecule-1 icam-1 pada retinopati diabetik proliferatif = Effect of laser photocoagulation to hypoxia inducible factor 1 hif 1 and intercellular adhesive molecule 1 icam 1 in proliferative diabetic retinopathy