Rates in developed countries such as Holland 4%, the United Kingdom 4%, Germany 7%, Belgium 7% and Sweden 10% are low. However, prevalence is a little bit higher in the USA 14%, France 15%, Spain 22% and Italy 22%.
En países desarrollados la prevalencia es baja: en Holanda 4%, Reino Unido 4%, Alemania 7%, Bélgica 7%, Suecia 10%; y un poco más alta en USA 14%, Francia 15%, España 22% e Italia 22%.