A recent study found no evidence of seasonal affective disorder in Iceland where the sun does not appear for a long time in the winter.
Seasonal affective disorder occurs when the sun doesn't appear for a long time in the winter.
( z1 disorder :mod ( z2 affective ) :time ( z3 season ) :time ( z4 appear :polarity - :ARG1 ( z5 sun ) :ARG1-of ( z6 long ) :time ( z7 date-entity :season ( z8 winter ) ) ) )