I personally much prefer to be greeted by Totoro than Mickey, but it is way more common to find Disney products in abandoned clinics. I imagine that it is because most Japanese people would feel more relax and dreamy when they see a famous but foreign and cute plush toy.
I found this clinic by myself, by walking around in a little onsen town. I actually had this intense feeling that there would be a few abandoned clinics around, and yes, I eventually found four of them! Only one was accessible howevever. This obstetric clinic.