MCHENRY, Ill.–(BUSINESS WIRE)–Medcor, a leading provider of onsite and mobile occupational health services across the United States and Canada, today announced it has entered into an agreement to join the APM Group, subject to Federal Trade Commission approval. Medcor and APM, an international health and human services organization operating in 11 countries, will work together to expand access for employers and their employees to high-quality, independent, advocacy-based occupational health ca