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.
The study showed that lack of sun caused disorders
( z1 show :ARG0 ( z2 study ) :ARG1 ( z3 cause :ARG0 ( z4 lack :ARG1 ( z5 sun ) ) :ARG1 ( z6 disorder ) ) )