The study population was divided into two populations: (1) cases that received a standardized pharmaceutical interview (2014-2015; intervention population) and (2) controls that did not receive a standardized pharmaceutical interview (2012-2013; control population).
Rannsóknarþýðinu var skipt í tvennt: Annars vegar tilfellahóp sem fékk staðlað lyfjafræðilegt viðtal (2014-2015) og hins vegar viðmiðunarhóp sem ekki fékk slíkt viðtal (2012-2013).