Dr. Elizabeth Lee Vliet, MD Dr. Vliet has been a leader in patient centered, individualized medical care. Since 1986, she has practiced medicine independent of insurance contracts that interfere with patient-physician relationships and decision-making. Dr. Vliet is the founder of Vive Life Center with medical practices in Tucson AZ and Dallas TX, specializing in preventive and climacteric medicine with an integrated approach to evaluation and treatment of women and men with complex medical and hormonal problems from puberty to late life.