Materials and methods Subjects A group of 418 adults (196 men and 222 women) with ages ranging from 18 to 60 years was selected as a representative sample of the Spanish adult population. All data were collected from January to September 2009.
Materials and methodsSubjectsA group of 418 adults (196 men and 222 women) withages ranging from 18 to 60 years was selected as a representative sample of the Spanish adult population. All datawere collected from January to September 2009.