การทำงาน, เปิด, หัวใจ, ศัลยกรรม, ยา, เป็นมนุษย์, ทางการแพทย์, คน, ทำงาน, วิทยาศาสตร์, ความรู้
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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