A patient, aged 28, complains of pain in the legs during walking, chilliness of feet, toes. Has being ill for a year. On examination: pale and cool legs skin, turgor diminished, hypotrichosis. Weakened pulsation on the hip and popliteal arteries, pulsation on the feet arteries is felt after nitroglycerine test. Rheographic index <1. What is the most likely diagnosis?