Implications of thyroglobulin antibody positivity in patients with differentiated thyroid cancer: a clinical position paper - Verburg, FA; Luster, M; Cupini, C; Chiovato, L; Duntas, LH; Elisei, R; Feldt-Rasmussen, U; Smit, JW; Rimmele, H; Seregni, E; Theimer, C; Giovanella, L (Thyroid, 2013)