A group of persons licensed to practice medicine in the State, who, as their principal professional activity, and as a group responsibility, engage or undertake to engage in the coordinated practice of their profession primarily in one or more group practice facilities, and who in their connection share common overhead expenses if and to the extent such expenses are paid by members of the group, medical and other records, and substantial portions of the equipment and the professional, technical, and administrative staffs. Group practices use the acronyms PA, IPA, MSO and others. Group practices are far more common now than a decade ago because physicians seek to lower costs, increase contracting power and share payer contracts.