S.C. Code Ann. § 44-113-20
As used in this chapter:
(10) "Investment interest" means an equity or debt security issued by an entity including, except as provided below, but not limited to, shares of stock in a corporation, units or other interests in a partnership, bonds, debentures, notes, other equity interests, or debt instruments. The following investment interests are excepted from this definition:
(12) "Referral" means a referral of a patient by a health care provider for health care services including, but not limited to:
(14) "Group practice" means a group of two or more health care professionals legally organized as a partnership, professional corporation, not-for-profit corporation, faculty practice plan, or similar association in which: