The structure of the EURbG is based around “work packages”(WP), with each of the 8 work packages representing a difference element of RB management. Each WP is led by a nominated national group and other groups are appointed as participants in each WP. WP Leaders constitute the Board of the group. For each WP, the WP leader will appoint a committee with a minimum of 3 coworkers from hubs of expertise in different centers who will participate in the decisions in their WP and deliver the expert advice to the requests received. For each committee, ideally the proportion of specialists would vary according to the scope, but in all of them there will be at least one ophthalmologist and one pediatric oncologist.