Lower Extremity Venous Disease and Treatment of Post-Thrombotic Syndrome Superficial Disease Superficial Thrombophlebitis Superficial Reflux Sclerotherapy Greater Saphenous Vein Stripping Phlebectomy Thermal Ablation Non-thermal Ablation Deep Venous Disease Acute Deep Venous Thrombosis Surgical Thrombectomy Endovascular Treatment Line Associated Deep Venous Occlusive Disease