@article{ZielenReichertDonathetal.2021,
  author    = {Stefan Zielen and Gianna Reichert and Helena Donath and Jordis Trischler and Johannes B. Schulze and Olaf Eickmeier and Jonas Martin Eckrich and Katharina Bl{\"u}mchen},
  title     = {Tiotropium as an add-on treatment option for severe uncontrolled asthma in preschool patients},
  journal   = {Journal of asthma and allergy},
  volume    = {14},
  pages     = {23 -- 30},
  doi       = {10.2147/JAA.S274544},
  year      = {2021},
}