instruction: what were the top three most common procedures in patients of age 60 or above in 2105?
response: SELECT t1.treatmentname FROM (SELECT treatment.treatmentname, DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS c1 FROM treatment WHERE treatment.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.age >= 60) AND STRFTIME('%y', treatment.treatmenttime) = '2105' GROUP BY treatment.treatmentname) AS t1 WHERE t1.c1 <= 3