… Crohn’s disease (CD) and ulcerative colitis (UC), commonly referred to as inflammatory
bowel disease (IBD), are chronic intestinal diseases of partly unknown etiology. UC has been …

… countries. Most of these studies have originated in high-income countries, and countries …
These studies also do not include estimation over time and usually do not include estimates …

… of inflammatory bowel disease in newly industrialised countries such as China offers an
unprecedented opportunity to essentially travel back in time and study the origin of a disease …

… In total, one hundred forty studies reporting data from 38 countries were considered in this
review. … of pediatric IBD over time indicates its emergence as a global disease, suggesting that …

… eastern and western countries by summarizing … disease at time of diagnosis as well as an
increased risk of surgery. Hypothetically, the extent of diagnostic delay in Asian countries might …

… terms Western countries and industrialized countries to refer … this time the incidence of Crohn’s
disease and ulcerative colitis … IBD in Western countries during the 20th century (Figure 1). …

… inflammatory bowel disease (IBD) across the four the stages of IBD evolution. Developing
countries … of the twentieth century in developing countries of the time lagged behind that in the …

… a low incidence of inflammatory bowel disease (IBD). However, at the time of writing the general
… Developing countries have been marked as areas with a low incidence of IBD although, …

… Inflammatory bowel diseases occur due to an … countries where there are opportunities
to prospectively collect changing exposure data over time may provide clues to the disease …

… whereby the incidence of inflammatory bowel disease in most western countries has begun
to … If an author reported multiple time periods for a region, we used the most recent period for …