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Although nothing is specifically mentioned the author has an affiliation with New York Medical school. American Medical Association.
The article is supported by data analysis of accepted individuals in order to show the change in policy's effect on the contrbution to population increase of immigrants for medical resaons. This also includes a description and examples of the different parts of the law.
The articles arguments are supported with a look into the past, present, and future. They reference research done during the Vietnam War, people whom expierence PTSD, and the plans to come that will help provide pyschological help.
IPPNW is funded by donations and are a non-profit organization. They also recieved money upon recieving the nobel peace prize.
I think the one i can think of is EMS providers.