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In this study, the authors reported that the severity of IBS was positively correlated with low CH 4 exhaled, low microbial richness, absence of Methanobacteriales and enrichment with Bacteroides enterotypes
10.1016/S0140-6736(18)31773-2 178
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2.4 Sleep quality Sleep was assessed using PSQI including seven characterizes: subjective sleep quality, sleep onset latency, sleep duration, sleep efficiency, disturbance, hypnotic drug use, and daytime disfunction (Buysse et al., 1989)
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