Is there any known way to trigger a bladder contraction?

Is there any known way to triggera bladder contraction?For example with ultrasound or something? or:Is there any known way to triggera bladder contr

Is there any known way to triggera bladder contraction?
For example with ultrasound or something?

or:Is there any known way to triggera bladder contraction?For example with ultrasound or something?

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