#15

RCT

#16

Controlled clinical trial

#17

Clinical trial

#18

#1 or #2 or #3 or #4 or #5

#19

#6 or #7 or #8 or #9 or #10

#20

#11 or #12 or #13 or #14 or #15 or #16 or #17

#21

#18 and #19 and #20