Hubungan antara profil besi dan hemoglobin pra-transfusi dengan pubertas terlambat pada pasien thalassemia mayor remaja di RSUPN dr. Cipto Mangunkusumo Jakarta (RSCM) = Association between iron profile and pre transfusion hemoglobin with delayed puberty in adolescent thalassemia major patients in dr. Cipto Mangunkusumo National Public Hospital Jakarta (RSCM)