 In Canada, between 1998 and 2000, the number of new cases per year was 12.9 per 100,000 population or 4,500 new cases.The number of people affected was estimated to be 211 per 100,000 or 104,000.In the United Kingdom 10 per 100,000 people newly develop the condition a year while the number of people affected is 243 per 100,000.