Looking to add some healthcare companies to your stock portfolio? In this post, we will recommend several companies that have long-term upside for investors that like to buy and hold. 1) CHA Medical Group A holding company that has a controlling interest in various hospitals, clinics and research labs around California and South Korea, those looking to invest in a privately-held healthcare company will be well-served to park their money with CHA Medical Group. Led by Chief Executive Officer Dr. Kwang Yul Cha, they began doing business in the United States of America with the acquisition of the Hollywood Presbyterian…