"post-obstructive causes (usually chronic, but 'new' changes can occur)"
Line 4:9·Only use medical adjectival hyphens where the letters at the end and start of the compound word are the same, e.g. post-transplant. In this case, don't use the hyphen: 'post-obstructive'.
Strong
warning
"post-obstructive causes (usually chronic, but 'new' changes can occur)"
Line 4:1·Generally, don't use bold in text: '<strong>post-obstructive causes</strong>'
"infection"
Line 13:1·Generally, don't use bold in text: '<strong>infection</strong>'
Acronyms
warning
"atypical lung infection, e.g. EBV, mycoplasma"
Line 17:38·'EBV' has no definition. Spell it out if it's unfamiliar to the audience.