Twelve-months follow-up of supervised exercise after percutaneous transluminal angioplasty for Intermittent claudication: A randomised clinical trial Bø, Elisabeth, Hisdal, Jonny, Småstuen, Milada Cvancarova, Stranden, Einar, Jørgensen, Jørgen J., Sandbæk, Gunnar, Grøtta, Ole Jørgen, Bergland, Astrid (2013)