All

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 C08 Respiratory Tract Diseases D012140 +
  C08.381 Lung Diseases D008171 +
   C08.381.483 Lung Diseases, Interstitial D017563 +
    C08.381.483.125 Alveolitis, Extrinsic Allergic D000542 +
     C08.381.483.125.125 Bird Fancier's Lung D001716 
 C08 Respiratory Tract Diseases D012140 +
  C08.674 Respiratory Hypersensitivity D012130 +
   C08.674.055 Alveolitis, Extrinsic Allergic D000542 +
    C08.674.055.125 Bird Fancier's Lung D001716 
 C20 Immunologic Diseases D007154 +
  C20.543 Hypersensitivity D006967 +
   C20.543.480 Hypersensitivity, Immediate D006969 +
    C20.543.480.680 Respiratory Hypersensitivity D012130 +
     C20.543.480.680.075 Alveolitis, Extrinsic Allergic D000542 +
      C20.543.480.680.075.125 Bird Fancier's Lung D001716 
 C21 Disorders of Environmental Origin D007280 +
  C21.447 Occupational Diseases D009784 +
   C21.447.125 Bird Fancier's Lung D001716