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Comparison between the recovery time of alfentanil and fentanyl in balanced propofol sedation for gastrointestinal and colonoscopy: a prospective, randomized study

Wai-Meng Ho, Chia-Ming Yen, Chin-Hung Lan, Chung-Yi Lin, Su-Boon Yong, Kai-Lin Hwang and Ming-Chih Chou*

BMC Gastroenterology 2012, 12:164  doi:10.1186/1471-230X-12-164

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