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BACKGROUND Adenoid cystic carcinoma (ACC) of the trachea is rare. The clinical manifestations, natural history, and responses to therapy differ from those of other malignant tracheal tumors. METHOD In this retrospective study, we examined pathological records of patients in the Department of Pathology at Chang Gung Memorial Hospital from 1990 through(More)
Pedagogical research demonstrates theories and practices of perception or production of melodic or harmonic " intonation " , i.e. the realization of pitch accuracy. There are software and hardware to help students improve intonation. Those tools have various functions. Nevertheless, they still miss something which could benefit users very much. Even worse,(More)
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