Correlative 201Tl SPECT, MRI and ex vivo 201Tl uptake in detecting and characterizing cervical lymphadenopathy in head and neck squamous cell carcinoma. - Valdés Olmos RA; Koops W; Loftus BM; Liem IH; Gregor RT; Hoefnagel CA; Hilgers FJ; Balm AJ (Journal of nuclear medicine : official publication, Society of Nuclear Medicine, 1999)