He was a graduate of the School of Medicine at Padua, the best in Europe.

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He's a graduate of University of Chicago Pritzker School of Medicine.

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Ms Johnston, 28, is a graduate of the London School of Hygiene and Tropical Medicine.

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"If 40 million people come online with access to medicine, the system won't be able to accommodate them, " says Dr. Russell Robertson, chairman of the Council on Graduate Medical Education and a professor at Northwestern's Feinberg School of Medicine.

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"I have a couple of 30-year-olds who are still in graduate school, " says Margaret Blythe, a professor of pediatrics at Indiana University School of Medicine, and chairwoman of the American Academy of Pediatrics' committee on adolescents.

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