title: Reply to the letter by Andrade.
authors.affiliation: Department of Neurology, China Medical University Hospital, Taichung, Taiwan, ROC; School of Medicine, China Medical University, Taichung, Taiwan, ROC.
authors.forename: Yu-Wan
authors.initials: YW
authors.lastname: Yang
authors.affiliation: Department of Urology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan, ROC; School of Medicine, Tzu Chi University, Hualian, Taiwan, ROC.
authors.forename: Teng-Fu
authors.initials: TF
authors.lastname: Hsieh
authors.affiliation: Department of Otolaryngology, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan, ROC; Department of Education, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan, ROC; Center for Clinical Epidemiology and Biostatistics, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan, ROC. Electronic address: hematcd@hotmail.com.
authors.forename: Ching-Chih
authors.initials: CC
authors.lastname: Lee
mesh_terms: D005260:Female; D006801:Humans; D006993:Hypnotics and Sedatives / Q000009:adverse effects*; D008297:Male; D010300:Parkinson Disease / Q000453:epidemiology* / Q000209:etiology*; D011725:Pyridines / Q000009:adverse effects*; D012893:Sleep Wake Disorders / Q000188:drug therapy* / Q000453:epidemiology*
chemical_list: D006993:Hypnotics and Sedatives; D011725:Pyridines
keywords: Estazolam; Parkinson's disease; Risk; Sleep disturbance; Zolpidem