Teens are often left out of medical research because they may need different treatments than adults. This is because of their growing bodies. 

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Another issue that comes up with including teens in research is getting permission from parents. We have found that teen participation in research is a lot lower when permission from parents is needed. Because of this, we end up with groups of teens that are not like the real world. This is why it is important to have teens decide for themselves to participate or not.