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Randomized Controlled Trial
©The Author(s) 2016.
World J Gastroenterol. Dec 14, 2016; 22(46): 10242-10248
Published online Dec 14, 2016. doi: 10.3748/wjg.v22.i46.10242
Figure 1
Figure 1 Nitrous oxide sedation system (AII 5000C; Shenzhen Security Technology Co. , Ltd., China).


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