Hi again, Brenda, and thanks for your post. I see my colleague, , has replied to your inquiry with an excellent reference that addresses your concern.
I also noticed you posted a similar question, elsewhere on our COPD.net platform Both John and I were able to respond to you there as well.
For ease of reference, here is a link to that conversation: https://copd.net/members/brenda01902/status/116124#upsr-86242.
I do hope you have an opportunity to look it over at your leisure.
All the best,
Leon (site moderator COPD.net)