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“Our most unequivocal evidence is that private equity is associated with increased costs,” says Alexander Borsa, a Ph.D. candidate in sociomedical sciences at Columbia University.

Editor's Note: Susannah Hills, the author of this opinion piece, is an assistant professor of otolaryngology head and neck surgery at the Vagelos College of Physicians and Surgeons.

Cryptosporidium, a parasite, is another common cause of gastrointestinal illness, said Victoria Lynch, an environmental epidemiologist at the Columbia University Mailman School of Public Health.

Cecilia Sorensen, an associate professor of emergency medicine at Columbia University, talks about how kids, parents, and everyone else can protect themselves during the heat wave.