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John Rowe, a professor of health policy and aging at Columbia University Mailman School of Public Health, predicts that fertility rates will drop even lower in the coming years.

Dr. Arthur Williams is an assistant professor at Columbia University's Division on Substance Use Disorders, in New York City.

These can include intestinal issues such as abdominal pain, bloating, diarrhea, unintentional weight loss, nausea, and vomiting, says Dr. Benjamin Lebwohl of Columbia University Irving Medical Center.

Rita Charon, a Harvard University-trained physician with a Ph.D. in English literature, is the founding chair and professor of medical humanities at the Columbia University Irving Medical Center.