1 Subjects: “...passive immunization...”

2 Subjects: “...passive walking...”

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

4 Subjects: “...passive adherence...”

5 Subjects: “...passive free time...”

6 Subjects: “...passive immunization...”

7 Subjects: “...surface passivation...”

8 Subjects: “...surface passivation...”

9 Subjects: “...passive sampling...”

10 Subjects: “...passive free time...”

11 Subjects: “...passive scalar...”

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

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

14 Subjects: “...passive immunization...”

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

16 Subjects: “...passive immunity...”

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

18 Subjects: “...passive safety...”