I had doctor friend on my club, just 1 person.
He also invite me to play with his group to, going there once & its all his medical friend.
I also had my co worker group on company i work on & i also saw other company group player.
I think its not about medical or not but (nor sure about other country) badminton here are growing fast in the past few year. Seeing how many badminton court opened every year & how full it is nowdays which quite hard to get a court without book it a week before.