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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.