ให้ระบุจำนวนผู้ป่วยที่เกิดก่อนปี พ.ศ. 2566 และนับถือศาสนาโปรเตสแตนต์เควกเกอร์ ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
give the number of patients who are born before the year 2023 and follow the religion protestant quaker.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 WHERE demographic.religion = "PROTESTANT QUAKER" AND demographic.dob_year < "2023"