Cordectomy by CO2 laser or radiotherapy for small T1a glottic carcinomas: costs, local control, survival, quality of life, and voice quality - Goor, K M; Peeters, A J; Mahieu, H F; Langendijk, J A; Leemans, C R; Verdonck-de Leeuw, I M; van Agthoven, M (Head Neck, 2007)