instruction: how many patients whose diagnoses short title is react-oth vasc dev/graft and drug type is additive?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE diagnoses.short_title = "React-oth vasc dev/graft" AND prescriptions.drug_type = "ADDITIVE"