SAN FRANCISCO, CA - MARCH 9: Apple Senior Vice President of Operations Jeff Williams announces ResearchKit for the medical field during an Apple special event at the Yerba Buena Center for the Arts on March 9, 2015 in San Francisco, California. Apple Inc. is expected to unveil more details on the much anticipated Apple Watch, the tech giant's entry into the rapidly growing wearable technology segment. (Photo by Stephen Lam/Getty Images)
