Diagnoses were made by the patient’s psychiatrists. The patients were
recruited from the inpatient and outpatient departments
of the University Hospital Groningen. Additional inclusion
criteria were that patients had to be between 18
and 50 years of age, be willing to participate and give
informed consent. Any patients taking oral medication
that affected the metabolism of prostaglandins, such as
NSAIDs or corticosteroids, were excluded from the
study, as were people with dermatological symptoms
in the forearm that could interfere with the assessment
of the skin reaction.