
Keywords: IBS; irritable bowel syndrome; QoL; quality of life; IBSSS; IBS severity score system; IBS-QoL; IBS specific QoL; GI; gastrointestinal; IBS-D; diarrhea-predominant; IBS-C; constipation-predominant; IBS-A; alternating bowel habits; TNFα; tumor necrosis fa