Management and surgical treatment of parathyroid carcinoma: a 6-year experience of a single centre of endocrine surgery unit oleh Rita Laforgia, Giovanni Tomasicchio, Federica Cavalera, Maria Sblendorio, Annamaria Spadone, Ferdinando Massimiliano Anelli, Pierluigi Lobascio, Rinaldo Marzaioli, Annunziata Panebianco, Angela Pezzolla