Dr. Zifan Wang is a Postdoctoral Research Fellow in the Harvard T.H. Chan School of Public Health in Cambridge, Massachusetts.
15:12
The age of first menstruation trended downward from 1950 to 2005, but more so among low-income kids and kids of color.
| Cookie | Duration | Description |
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| li_gc | 2 years | No description |
| loglevel | never | No description available. |
| msToken | 10 days | No description |