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.
Search the article title to locate the full text. If you see "Access Onine", it will take you to the full text. If there's no Access Onine button, you'll need to request the full text through Information Delivery.
"time spa" AND design
spa AND design
wellness AND "interior design"
"health facility environment"
"health care design"