Nurses and therapist rescue infants from Dorian’s path with ‘mini ICU on wheels’ Video

Now Playing: Former nurse with Parkinson’s disease surprised with service dog

Now Playing: A nurse who cared for AIDS patients in the 1980s on why the fight must continue

Now Playing: Nurses and therapist rescue infants from Dorian’s path with ‘mini ICU on wheels’

Now Playing: What is cupping?

Now Playing: Michigan bans flavored e-cigarettes

Now Playing: More than 2 glasses of soda daily linked tied to higher risk of death: Study

Now Playing: Is vaping marijuana making people ill?

Now Playing: How Instacart helped a man lose 300 pounds

Now Playing: Principal who accepted ‘air hugs’ during chemo returns to greet kids cancer-free

Now Playing: Cancer-fighting mom of 3 works out during chemo

Now Playing: Surgeon general warns of marijuana use while pregnant

Now Playing: Trebek done with chemo, back on ‘Jeopardy!’

Now Playing: Milwaukee issues health alert for people to ‘immediately’ stop vaping

Now Playing: Bionic legs help paralyzed man walk again

Now Playing: Surgeon general issues advisory on risks of marijuana use by youth, pregnant women

Now Playing: What to know about secondhand vaping dangers

Now Playing: Officials in Wisconsin ask public to stop vaping immediately

Now Playing: Milwaukee urges residents to stop using e-cig products

Now Playing: 7-year-old boy meets his bone marrow donor from Germany

Now Playing: Measles concerns grow as kids return to school