1 Subjects: “...passive walking...”

2 Subjects: “...passive heating systems...”

3 Subjects: “...passive adherence...”

4 Subjects: “...passive immunization...”

5 Subjects: “...passive scalar...”

6 Subjects: “...passive drug transport...”

7 Subjects: “...passive avoidance test...”

8 Subjects: “...passive acoustic monitoring...”

9 Subjects: “...passive immunity...”

10 Subjects: “...continuous passive motion...”