From a description of a clinical study:
Of the 12 patients with CFD, 10 showed improvement after referral for treatment with folinic acid (1-2 mg/kg/day) for at least 6 weeks (range, 6-79 weeks) while continuing their preevaluation treatment regimens.
Does this mean that the doctors managing the study did not prescribe the medicine personally but rather directed the patients to other doctor(s) who wrote the prescription?
Could it mean basically "the very doctors who managed the study prescribed the folinic acid to the patients", with the word "referral" lacking any "rerouting" meaning?
In Wiktionary, meaning 3 of the verb refer is described thus:
To submit to (another person or group) for consideration; to send or direct elsewhere.
He referred the matter to the principal.
to refer a patient to a psychiatrist