ระบุจำนวนผู้ป่วยที่รักษาตัวในโรงพยาบาลเกิน 13 วัน และชื่อยา คาโพซอล ไม่จำเป็นต้องใช้ตารางทั้งหมด
provide the number of patients whose days of hospital stay is greater than 13 and drug name is caphosol?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 prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE demographic.days_stay > "13" AND prescriptions.drug = "Caphosol"