instruction: count the number of patients whose primary disease is coronary artery disease\coronary artery bypass graft with mvr; ? maze and days of hospital stay is greater than 16?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic WHERE demographic.diagnosis = "CORONARY ARTERY DISEASE\CORONARY ARTERY BYPASS GRAFT WITH MVR; ? MAZE" AND demographic.days_stay > "16"