Final answer:
The provided references do not contain enough information to determine what Johnson & Danhauer showed in their 1997 study. Specific context about their study is needed.
Step-by-step explanation:
I apologize, but without specific information about Johnson & Danhauer's 1997 study and considering that the provided references like Lee et al. (2001), Carruthers and Wanamaker (2017), and others don't mention their work, it's challenging to offer insights into their findings. Johnson & Danhauer's study remains elusive without a clear reference or context regarding their research focus, methodology, or outcomes.
To provide accurate information about their study, additional details such as the title of the study, the specific field or discipline it pertains to, or any keywords associated with their research would be essential. Additionally, knowing the context in which their work is mentioned in other references could provide clues about the nature and significance of their study.
If more details or context about Johnson & Danhauer's 1997 study become available, I would be happy to assist in providing relevant information and insights based on the provided references or any additional information you can provide.