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Continue to ChatIf there is an increased risk among twins but not among singletons one could suspect that the observed risk is associated with twinning and not with the procedures per se. - Sven Sandin from https://whatsmyquote.com/quote/if-there-is-an-increased-risk-among-twins-but-not-among-singletons-one-could-suspect-that-the-observed-risk-is