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Editor's note: This is the second in our two-part series on physician philanthropy. In our June issue, we examined how you can combine investing and charity by adding a social investment plan to your portfolio. Medical school students say that one of the top reasons they choose medicine as a career is the desire to make a difference in people's lives, according to an annual survey conducted by the American Association of Medical Colleges. This philanthropic aspiration compels many physicians later in their careers to volunteer their time and medical skills to charitable causes, both in the United States and abroad.