ระบุจำนวนคนไข้ที่วินิจฉัยรหัส icd9 ได้ 53,390 และผลตรวจแล็ปผิดปกติเป็น delta หรือไม่ไม่จำเป็นต้องใช้ตารางทั้งหมด
provide the number of patients whose diagnoses icd9 code is 53390 and lab test abnormal status is delta?It is not neccessary to use all the tables.
 demographic:  subject_id [ text]  hadm_id [ text]  name [ text]  marital_status [ text]  age [ text]  dob [ text]  gender [ text]  language [ text]  religion [ text]  admission_type [ text]  days_stay [ text]  insurance [ text]  ethnicity [ text]  expire_flag [ text]  admission_location [ text]  discharge_location [ text]  diagnosis [ text]  dod [ text]  dob_year [ text]  dod_year [ text]  admittime [ text]  dischtime [ text]  admityear [ text] 
SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN lab ON demographic.hadm_id = lab.hadm_id WHERE diagnoses.icd9_code = "53390" AND lab.flag = "delta"