How hard is it to land an internship with NIH?

<p>Hey guys. someone earlier this year someone from NIH called me and told me about the internship opportunities they have for college students. I am a college sophomore nursing student and really want to land an internship with them. He told me to email PIs for informational interviews but none of them emailed me back when I asked them a little bit about their career. I REALLY want this. At first I wanted to work in the lab but with the courses I took for nursing school, it does not coincide with the requirements needed for the lab. Therefore, I want to try to apply to the clinical hospital. Please help me with some tips! Thank you in advance! </p>