For citations:
Abdelwahab H.W., Shata H.M., Abdelghany D.A., Elmaria M.O. Frailty phenotype in chronic obstructive pulmonary disease patients: prevalence and relation to disease severity. PULMONOLOGIYA. 2023;33(5):595-599. https://doi.org/10.18093/0869-0189-2023-33-5-595-599