Selection Bias Selection bias occurs when the selection of participants in one group results in a different outcome than the selection for the other group
1 As of 2015, there are more than 96,000 osteopathic medical physicians in the United States.  By 2020, the number of osteopathic medical physicians will be over 100,000, say expert predictions, according to the American Medical Association.
We need more doctors. On a global scale, the shortage is staggering: The World Health Organization says we need 15 percent more doctors. In the United States, the American Association of Medical Colleges estimates the current deficit at almost 60,000 and forecasts a worrisome 130,600-doctor shortfall by 2025.