Inhaled water droplets.
D000402:Airway Obstruction / Q000628:therapy; D002648:Child; D002675:Child, Preschool; D006801:Humans; D006875:Hydrotherapy / Q000009:adverse effects*; D007223:Infant; D010316:Particle Size; D011877:Radionuclide Imaging; D012138:Respiratory Therapy / Q000009:adverse effects*