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Different urination processes in on/off state. (a) one of the circles represents that the duration of urination lasted about 6 seconds (10 circles represent 1 minute, a row of circles in one line represents 2 minutes in total). (b) A black circle indicates that the urinary flow lasted less than 3 seconds (including no flow). (c) A white circle indicates that the urinary flow lasted more than 3 seconds.
