Kiwi -
Yes they are (maybe even more often than every 3 months, I am not sure what the schedule is). Hawthorne effect applies to both groups, and will not alter hard objective physiological outcomes (e.g., MI, re-stenting). Keep in mind the whole reason for including a placebo control group is to address any influence on results simply of being observed repeatedly, taking part in a trial, expectations, etc.
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