Are there restrictions on selecting riders for the U/23 World Road Championships beyond the obvious of being under the age of 23? I ask this having read the CN story on the Australian team and noting that Jack Bobridge isn't listed, despite being under 23 and the reigning U/23 TT champ (and one of Australia's best road riders). Is there a restriction if you are riding with a ProTour team and not as a stagaire or something?