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normalize et al. (AMA)
}}</ref> The pressure of the urine is necessary to open it to allow passage of urine. The pressure is what causes the ballooning.
Babu ''et al''. (2004) compared boys with ballooning with boys without ballooning. No evidence of obstructed urinary flow was found. Ballooning is a self-limiting condition that disappears with normal development.<ref name="babu2005">{{REFjournal
|last=Babu
|first=Ramesh