   Healthy controls                                        0.00 ± 0.00% in sputum                                                                                                                                                                                                                                                                      Severe asthma                                           0.00 ± 0.00% in sputum                                                                                                                                                                                                                                                                      Mild asthma                                             0.00 ± 0.00% in sputum                                                                                                                                                                                               Pha