Choose which of the following limitations are not related to construct validity, in a study of home UV treatment of depressive illnesses.
A) An interventional study has a 60% attrition rate.
B) The operational definitions are not in line with the conceptual definitions.
C) The study framework is related to the social costs of depressive illness.
D) The subjects excluded from participation in a study of depressive illness and UV home treatment were those who had been hospitalized in the past for depression.
E) The multi-site study examining UV home treatment and depressive illness is conducted only in major west coast urban centers.
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