Very best wishes, and relieving to hear of some immediate improvement.
The story of British rower Alex Partridge shows that suffering a collapsed lung is not necessarily detrimental to a world class sporting career - though he was much older when he suffered his, prior to the Beijing Olympics. May Katie similarly soon return to full health and even more successes.
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Data I post, opinions I offer, 'facts' I assert, are almost certainly all stupidly wrong.