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- Birth control 3
- Birth interval 3
- Birth Intervals 12
- Birth intervals 10
- Birth Order 1
- Birth Rate 7
- Birth rate 3
- Birth records 1
- Birth spacing 1
- Birth Weight 6
- Birth weight 18
- Birth weight, Law-Infant 1
- Birth-preparedness 1
- Bismuth 5
- bismuth subsalicylate 1
- Blindness 4
- Blood 7
- blood 2
- Blood anslysis 1
- Blood bactericidal activity 2