[Answer] A new study, which used cellphone mobility data from 10 U.S. cities, provides more precise estimates for how much each kind of indoor venue contributed to urban outbreaks. \\According to this research, which type of indoor space is riskiest to visit, in terms of new coronavirus infections?\

Step 1 : Introduction to the question "A new study, which used cellphone mobility data from 10 U.S. cities, provides more precise estimates for how much each kind of indoor venue contributed to urban outbreaks. \\According to this research, which type of indoor space is riskiest to visit, in terms of new coronavirus infections?\"

...1. Restaurants
2. Coffee shops\
3. Gyms
4. Hotels\

Step 2 : Answer to the question "A new study, which used cellphone mobility data from 10 U.S. cities, provides more precise estimates for how much each kind of indoor venue contributed to urban outbreaks. \\According to this research, which type of indoor space is riskiest to visit, in terms of new coronavirus infections?\"

Restaurants:

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“Restaurants were by far the riskiest places, about four times as risky as gyms and coffee shops, followed by hotels” in terms of new infections, said Jure Leskovec, a computer scientist at Stanford University and the senior author of the new study, which was published in the journal Nature on Tuesday.\\Public officials across Europe and in parts of the United States have begun to institute partial closures or restricted indoor hours for restaurants and bars as cases have surged in recent weeks. These measures are especially important in lower-income areas, where infections exploded last spring, most likely because the public venues in those communities tend to be more crowded than elsewhere, the study suggests. \

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