physician referral, physician recruitment, and physician practice management services; namely, billing, bookkeeping, patient scheduling, management of patient information and records, management and review of physician practice charges, personnel management, procurement of medical supplies, business planning and supervision, and computer services; namely, computerized accounting services, computerized data base management, and computer information storage and retrieval of hospital and physician clinical information

credit and debt recovery and collections for physicians' practices, management of accounts receivable