Primary ciliary dyskinesia: critical evaluation of clinical symptoms and diagnosis in patients with normal and abnormal ultrastructure - Boon, M; Smits, A; Cuppens, H; Jaspers, M; Proesmans, M; Dupont, L J; Vermeulen, F L; Van, D S; Malfroot, A; Godding, V; Jorissen, M; De, B K (Orphanet J Rare Dis, 2014)