Business intermediary and advisory services in the field of facilitating and coordinating introductions, negotiations, contracts, and relationships between radiologists, radiology practices, and medical imaging facilities and third parties requiring their services; promoting the services of radiologists, radiology practices, and medical imaging facilities by organizing them into a network and facilitating and coordinating introductions to, and negotiations, contracts, and relationships with, third parties requiring such services; administration, billing, and collection of accounts of third parties on behalf of radiologists, radiology practices, and medical imaging facilities contracted with such third parties to provide their services to such third parties