- Correspondence to Perry Gottesfeld, Occupational Knowledge International, San Francisco, CA 94118, USA;
- Received March 21, 2019
- Revised August 2, 2019
- Accepted August 23, 2019
- First published September 5, 2019.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.