Value of routine measurement of serum calcitonin concentrations in patients with nodular thyroid disease: A multicenter study - Papi, G; Corsello, S M; Cioni, K; Pizzini, A M; Corrado, S; Carapezzi, C; Fadda, G; Baldini, A; Carani, C; Pontecorvi, A; Roti, E (J Endocrinol Invest, 2006)