This study was a randomized trial, conducted in Reykjavik,
Iceland. The trial was conducted in two 6-month intervention
phases after enrollment with baseline assessments prior to the
start of the study (time-point 1). Outcome assessments were
performed at the end of the first intervention phase (time-point 2)
and at the end of the second (delayed) intervention phase (timepoint
3). Details about the study design have been described
previously [13].