Is it hard to become a cardiologist?

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Tags

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2. #challenge
3. #complete
4. #becoming
5. #residency
6. #often
7. #internal
8. #schooling
9. #years
10. #medicine
11. #cardiologist
12. #three
13. #might
14. #followed
15. #fellowship
16. #cardiology
17. #involves
18. #doctors
19. #which