[1] Newcastle Upon Tyne Hosp NHS Trust, Dept Cardiol, Newcastle Upon Tyne, Tyne & Wear, England
[2] Newcastle Univ, John Walton Muscular Dystrophy Res Ctr, Newcastle Upon Tyne, Tyne & Wear, England
[3] Univ Hosp Birmingham NHS Fdn Trust, Dept Paediat Cardiol, Birmingham, W Midlands, England
[4] Birmingham Womens & Childrens NHS Fdn Trust, Birmingham Childrens Hosp, Dept Cardiol, Birmingham, W Midlands, England
[5] NHS Greater Glasgow & Clyde, Dept Cardiol, Glasgow, Lanark, Scotland
[6] Great Ormond St Hosp Children NHS Fdn Trust, Dept Paediat Cardiol, London, England
[7] Royal Hosp Children, Scottish Paediat Cardiac Serv, Glasgow, Lanark, Scotland
[8] Duchenne UK, London, England
[9] Guys & St Thomas NHS Fdn Trust, Dept Cardiol, London, England
[10] Univ Hosp North Midlands NHS Trust, Dept Cardiol, Stoke On Trent, Staffs, England
[11] Natl Hosp Neurol & Neurosurg, Dept Neuromuscular Dis, London, England
[12] Univ Coll London Hosp NHS Fdn Trust, Inst Neurol, London, England
[13] St Bartholomews Hosp Barts Heart Ctr, Barts Heart Ctr, London, England
[14] Cardiff & Vale Univ Hlth Board, Dept Cardiol, Cardiff, Wales