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An 89-year-old man receiving long-term anticoagulation with warfarin sodium (total weekly dosage of 19 mg) arrived at the anticoagulation clinic for his monthly visit.
 An 89-year-old man: Subject; 89-year-old: Subject.Age; long-term anticoagulation with warfarin sodium (total weekly dosage of 19 mg): Treatment; warfarin sodium: Treatment.Drug; weekly: Treatment.Freq; 19 mg: Treatment.Dosage; long-term: Treatment.Duration
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:
 An 89-year-old man: Subject; 89-year-old: Subject.Age; long-term anticoagulation with warfarin sodium (total weekly dosage of 19 mg): Treatment; warfarin sodium: Treatment.Drug; weekly: Treatment.Freq; 19 mg: Treatment.Dosage; long-term: Treatment.Duration