As a form of treatment,Joanne receives phototherapy,in which she sits in front of a light box for a few hours a day every morning.Judging from this treatment,Joanne most likely suffers from

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Phototherapy or light therapy is a common and effective treatment for seasonal affective disorder (SAD), a type of depression that is related to changes in the seasons, particularly the decrease in daylight hours during the fall and winter months. Therefore, Joanne's treatment with phototherapy suggests that she most likely suffers from SAD.

As a Form of Treatment,Joanne Receives Phototherapy,in Which She Sits