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von Bonin, Dietrich; Klein, Sabine D.; Würker, Jana; Streit, Eva; Avianus, Oliver; Grah, Christian; Salomon, Jörg; Wolf, Ursula (2018). Speech-guided breathing retraining in asthma: a randomised controlled crossover trial in real-life outpatient settings. Trials, 19(1), p. 333. BioMed Central 10.1186/s13063-018-2727-z
