Search 1: MeSH headings – intermittent claudication  Intermittent claudication AND Prognosis  Intermittent claudication AND fate  Intermittent claudication AND natural history  Intermittent claudication AND progression  Intermittent claudication AND outcome Search 2: MeSH headings - peripheral arterial disease, peripheral vascular disease  Peripheral arterial disease/ peripheral vascular disease AND Prognosis  Peripheral arterial disease/ peripheral vascular disease AND Progression  Peripheral arterial disease/ peripheral vascular disease AND natural history  Peripheral arterial disease/ peripheral vascular disease AND outcome |