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Group of women doing shoulder taps during a high-intensity interval training at the gym. Three fit caucasian women working out with a cardio routine indoors
Clock hands on a white plate. Gold fork and knife on a dark stone background. Concept of autophagy or interval fasting.
Ignition coil and car spark plug change or replacement. Repairing of vehicle engine.
PR interval was prolonged and QRS wave was not dropped when atrioventricular block was once performed.
Three timers showing varying time intervals with green segments indicating elapsed time.

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