Faktor-faktor yang memengaruhi timbulnya hipokalsemia pasca tiroidektomi total di divisi bedah onkologi FKUI/RSCM, Januari 2013 Desember 2015 = Factors that influence the incidence of hypocalcemia after total thyroidectomy in surgical oncology division of faculty of medicine RSCM Januari 2013 December 2015