instruction: what is the number of home health care discharge patients who have acute venous embolism and thrombosis of deep vessels of proximal lower extremity diagnoses?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id WHERE demographic.discharge_location = "HOME HEALTH CARE" AND diagnoses.long_title = "Acute venous embolism and thrombosis of deep vessels of proximal lower extremity"