Table 2 Search method.

Microgravity

microgravity

1

All fields

spaceflight

2

All fields

hypogravity

3

All fields

reduced gravity

4

All fields

zero gravity

5

All fields

weightlessness

6

All fields

micro-G

7

All fields

low gravity

8

All fields

zero-G

9

All fields

astronaut*

10

All fields

cosmonaut*

11

All fields

#1 OR #2 OR #3 OR #4 OR #5 OR #6 OR #7 OR #8 OR #9 OR #10 OR #11

12

Ultrasound

ultrasound

13

All fields

B?mode

14

All fields

echography

15

All fields

sonograph*

16

All fields

doppler

17

All fields

#13 OR #14 OR #15 OR #16 OR #17

18

Venous assessment

vein

19

All fields

venous

20

All fields

vte

21

All fields

dvt

22

All fields

#19 OR #20 OR #21 OR #22

23

All combined

#12 AND #18 AND #23

24