I-123 imaging for the prediction of I-131 therapy for recurrent differentiated thyroid cancer, RDTC, when I-131 tracer is negative but raised thyroglobulin, Tg - Britton, K; Foley, R; Siddiqi, A; Jan, H; Canizales, A; Plowman, P; Grossman, AB; Monson, J; Besser, G (1999)