Ali, Khalid, Warusevitane, Anushka, Lally, Frank, Sim, Julius, Sills, Sheila, Pountain, Sarah, Nevatte, Tracy, Allen, Martin, Roffe, Christine, "The stroke oxygen pilot study: a randomized controlled trial of the effects of routine oxygen supplementation early after acute stroke--effect on key outcomes at six months", PLoS One, 2013