Brief Article
Copyright ©2012 Baishideng Publishing Group Co.
World J Gastroenterol. Jul 21, 2012; 18(27): 3565-3570
Published online Jul 21, 2012. doi: 10.3748/wjg.v18.i27.3565
Figure 1
Figure 1 Flow diagram showing selection of study subjects. CO2: Carbon dioxide.