Dr. Ami Sperber, professor emeritus of Ben-Gurion University, initiated a 10-year epidemiology study of 73,000 patients in 33 countries. It found that over 40% of the world’s population have Disorders of Gut-Brain Interactions (DGBI). The data is vital to gastrointestinal knowledge.
https://www.gastrojournal.org/article/S0016-5085(20)30487-X/fulltext