Antibiotics for bronchiectasis exacerbations in children: rationale and study protocol for a randomised placebo-controlled trial oleh Chang Anne B, Grimwood Keith, Robertson Colin F, Wilson Andrew C, van Asperen Peter P, O’Grady Kerry-Ann F, Sloots Theo P, Torzillo Paul J, Bailey Emily J, McCallum Gabrielle B, Masters Ian B, Byrnes Catherine A, Chatfield Mark D, Buntain Helen M, Mackay Ian M, Morris Peter S