###HUMAN: what is the number of patients whose marital status is married and procedure long title is percutaneous [endoscopic] gastrostomy [peg]?, ###ASSISTANT: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id WHERE demographic.marital_status = "MARRIED" AND procedures.long_title = "Percutaneous [endoscopic] gastrostomy [PEG]"