Speak To Analyst Global Irritable Bowel Syndrome (IBS) Treatment Market Size, Share & Trends Analysis Report by Type (IBS-Constipation, IBS-Diarrhea, IBS-Mixed, and IBS-Unsubtyped) and by Drug Class (Eluxadoline, Linaclotide, Lubiprostone, and Others) and Forecast 2020-2026