Founded in 1976, Thunderbird Internal Medicine is one of the leaders in providing personalized care across the United States. Located at Phoenix, Ariz., it comprises of internal medicine physicians who work with specialists in areas, such as colorectal surgery, dermatology, podiatry, audiology and physician assistants. In addition, it offers sleep lab, clinical laboratory, imaging services and electronic medical record maintenance services. Other on-site services include arterial Doppler, bone density, echocardiogram, hemorrhoid clinic, pulmonary function and clinical research. The company is an authorized provider of Dr. Comfort therapeutic footwear that addresses the specific needs of people with diabetes and other foot related health issues.