The white patches, sometimes called sores, within the mouth cannot be scraped off but usually do not cause pain
There are the obvious ones, like a stipend for time and travel and the potential benefits of an investigational medication, but also more esoteric benefits, like increased quality of care, attention from medical staff, and knowledge about the conditions people face
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The studys own data shows their Beijing measurements peaking at under 300 micrograms per cubic meter (please dont confuse AQI with PM 2.5 concentration -- 300 micrograms per cubic meter is equivalent to an AQI reading of 301 to 400, or in the Hazardous zone, which aligns with Berkeleys press release statement)