About Susquehanna Obstetrics, Gynecology and Nurse Midwifery: Susquehanna Obstetrics, Gynecology and Nurse Midwifery of Advantia offers a full range of obstetric and gynecologic services through its two full-time offices located in Harford County, Maryland. About Advantia Health: To provide the highest quality patient care available, Susquehanna OB/GYN and Nurse Midwifery is partnered with Advantia Health.