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Joseph Semien, Jr., from left, Pierre Johnson and Maxime Madhere on their book called "Pulse of Perseverance: Three Black Doctors on Their Journey to Success." (Aaron Cormier via AP)

Joseph Semien, Jr., from left, Pierre Johnson and Maxime Madhere on their book called "Pulse of Perseverance: Three Black Doctors on Their Journey to Success." (Aaron Cormier via AP)

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Against the odds: 3 black doctors detail journey to success

One used to deal drugs on the streets of New Orleans. Another grew up in Chicago with two drug-addicted parents. A third survived the tough streets of New York and Washington, D.C., where he once stared down the barrel of a gun.