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Three hundred and thirty eight patients with moderate to severe painful diabetic neuropathy despite receiving their maximum tolerated dose of gabapentin, had oral prolonged-release oxycodone or placebo tablets added to their therapy for up to 12 weeks.
 Three hundred and thirty eight patients with moderate to severe painful diabetic neuropathy: Subject; Three hundred and thirty eight: Subject.Population; gabapentin: Treatment; oral prolonged-release oxycodone or placebo tablets added to their therapy for up to 12 weeks: Treatment; gabapentin: Treatment.Drug; prolonged-release oxycodone: Treatment.Drug; placebo: Treatment.Drug; maximum tolerated dose: Treatment.Dosage; oral: Treatment.Route; tablets: Treatment.Route; for up to 12 weeks: Treatment.Time_elapsed; painful diabetic neuropathy: Treatment.Disorder
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: potential therapeutic event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Treatment.Time_elapsed, Subject.Disorder, Subject.Race, Treatment.Route, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 Three hundred and thirty eight patients with moderate to severe painful diabetic neuropathy: Subject; Three hundred and thirty eight: Subject.Population; gabapentin: Treatment; oral prolonged-release oxycodone or placebo tablets added to their therapy for up to 12 weeks: Treatment; gabapentin: Treatment.Drug; prolonged-release oxycodone: Treatment.Drug; placebo: Treatment.Drug; maximum tolerated dose: Treatment.Dosage; oral: Treatment.Route; tablets: Treatment.Route; for up to 12 weeks: Treatment.Time_elapsed; painful diabetic neuropathy: Treatment.Disorder