What increases your chance of having twins?

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Tags

1. #treatment
2. #general
3. #fertility
4. #twins
5. #fraternal
6. #pregnancies
7. #percent
8. #occur
9. #conceived
10. #treatments
11. #identical
12. #increase
13. #chances
14. #population
15. #while
16. #births
17. #having
18. #multiple