They gave blood and saliva samples at home or at a nearby lab.
“The Pax LC trial is a historic contribution to the evolution of a new way of doing trials”
"Traveling to each participant’s home would seem to be a pricey endeavor. But given its greater efficiency, the design of the PAX LC Trial has actually cut down on costs", Krumholz argues.
Comment: The same issues arise with ME/CFS. I see Jarred Younger is doing one or more trials remotely
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