title: On beyond zebra: understanding rare diseases.
authors.forename: Harold R
authors.initials: HR
authors.lastname: Collard
mesh_terms: D015982:Bias; D001988:Bronchiolitis / Q000175:diagnosis*; D018450:Disease Progression; D006801:Humans; D008137:Longitudinal Studies; D017563:Lung Diseases, Interstitial / Q000175:diagnosis*; D011379:Prognosis; D035583:Rare Diseases / Q000175:diagnosis*; D012107:Research Design; D015983:Selection Bias