In addition to these publications specifically about healthcare, see the journals on the Commercial Design tab.
The Trustee Library provides access to many different collections of articles and is an excellent tool for academic research. Some of the best collections of healthcare articles, including some on design, are listed and linked below.
Credo Reference provides full-text online versions of over 3,500 published reference works from more than 100 publishers in a variety of major subjects.
"time spa" AND design
spa AND design
wellness AND "interior design"
"health facility environment"
"health care design"