"...with and without..." headline

hi, everyone. i'm making a flyer that reads something like this:

"Help us learn how PTSD affects the brain

"Researchers from the University of Washington are looking for volunteers both with and without Posttraumatic Stress Disorder that may be interested in participating in research."

and then it lists the study procedures and requirements. i'm struggling with the second sentence--it should imply that we are recruiting two kinds of people: people with PTSD and people without PTSD. however, i'm afraid that it implies that we want the with/without PTSDness in a single person, which is obviously impossible. so does it seem misleading or does it work as is? is there some other (concise) way to write it?

I've thought about something like:

"...are looking for volunteers with PTSD and volunteers without PTSD...," but my research group is afraid that people without PTSD will stop looking at the flyer if they're not included in the first phrase....

thanks!

-andrew