สุขภาพ, ตรวจสอบ, การเต้นของหัวใจ, ชีพจร, ความดันโลหิต, เส้นโค้ง, หัวใจ, หลอดเลือดดำ, เลือด, วงจรไฟฟ้า, ทางการแพทย์
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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