35 Non-clinical business and business administrative services to independent medical and dental practices, namely, accounting, advertising and marketing, human resources consultancy, human resources management, personnel recruiting, payroll administration and non-clinical management services, payroll preparation, payroll processing, administration of patient billing, professional credentialing verification services in the field of medical and dental practitioners, namely, verifying the licensure of professionals on behalf of others, record-keeping for regulatory compliance purposes, tracking and monitoring insurance compliances for business purposes, procurement, namely, purchasing or leasing medical and dental equipment as well as supplies traditionally used in the operation of medical and dental offices for others, patient appointment scheduling services, business advice, business management of dental laboratories of others, and the operation of dental laboratories for others