Sung, M.W., Kim, K.H., Kim, J.W., Min, Y.G., Seong, W.J., Roh, J.L., Lee, S.J., Kwon, T.K. and Park, S.W. (2003) Clinicopathologic predictors and impact of distant me-tastasis from adenoid cystic carcinoma of the head and neck. Archives of Otolaryngology—Head and Neck Surgery, 129, 1193-1197.