PubMed (("asthma"[MeSH Terms]) OR (asthma*[Title/Abstract]) OR (wheez*[Title/Abstract]) OR ("pulmonary disease, chronic obstructive"[MeSH Terms]) OR (COPD[Title/Abstract]) OR ("bronchiectasis"[MeSH Terms]) OR (bronchiectasis[Title/Abstract]) OR ("sleep apnea syndromes"[MeSH Terms]) OR ("sleep apnea"[Title/Abstract]) OR ("lung diseases, interstitial"[MeSH Terms]) OR ("pulmonary fibrosis"[MeSH Terms]) OR ("pulmonary fibrosis"[Title/Abstract]) OR ("pulmonary sarcoidosis"[Title/Abstract]) OR (IPF[Title/Abstract]) OR ("hypertension, pulmonary"[MeSH Terms]) OR ("pulmonary hypertension"[Title/Abstract]) OR ("pulmonary arterial hypertension"[Title/Abstract]) OR (PAH[Title/Abstract])) AND (("randomized controlled trial"[Publication Type]) OR (random*[Title/Abstract]) OR (placebo[Title/Abstract]) OR (trial[Title]))