Table 1 Correct posture for the operator^5,6

✓ The operator should sit as close as possible to the patient to avoid having to bend the back too much

✓ Both feet should be on the ground

✓ The upper border of the thighs should be slightly bent

✓ The long axis of the torso should be vertical (ie the back should be straight!)

✓ Both shoulders should be horizontal (not raised)

✓ Both arms should be in light contact with the rib cage