###HUMAN: how many patients are diagnosed with polyneuropathy in diabetes and treated with base drug?, ###ASSISTANT: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE diagnoses.long_title = "Polyneuropathy in diabetes" AND prescriptions.drug_type = "BASE"