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cardiology ecg ekg electrocardiogram electrocardiograph exam frequency graph grid health healthy heart heartbeat illustration life line medical monitor patient pressure pulsating pulse rate rhythm screen sick signal spike stress terminal test vitality waveGreen Signal Royalty-Free Stock Photography
![\](https://thumbs.dreamstime.com/m/wait-green-signal-making-turn-traffic-sign-close-up-view-safe-driving-tips-regulation-rules-flat-vector-274538215.jpg "\")
![Close-up of United States \](https://thumbs.dreamstime.com/m/close-up-united-states-one-vehicle-per-green-sign-one-vehicle-to-move-per-green-signal-safe-driving-tips-traffic-332198059.jpg "Close-up of United States \")
