BibTex format
@inbook{Bush:2019:10.1016/B978-0-323-44887-1.00046-8,
author = {Bush, A and Fleming, L},
booktitle = {Kendig's Disorders of the Respiratory Tract in Children},
doi = {10.1016/B978-0-323-44887-1.00046-8},
pages = {722--736.e5},
title = {46 - Severe Asthma},
url = {http://dx.doi.org/10.1016/B978-0-323-44887-1.00046-8},
year = {2019}
}