First-Born vs Second-Born: 10-Million-Sibling Study Maps 150 Disease Risk Differences

First-Born vs Second-Born: 10-Million-Sibling Study Maps 150 Disease Risk Differences
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First-Born vs Second-Born: 10-Million-Sibling Study Maps 150 Disease Risk Differences

A massive study of health records suggests that birth order may be associated with the risk of developing certain medical conditions.