All references must be from books and journals from 2017 until 2020

Regarding DOI (diffusion of innovation) theory 4 pages example (latest references 2017 ,2018, 2019, 2020) journals and book only
– What are the definitions?
– Whether this has been used to explain behavioral intention to use IOMT?
– What are the pros and cons of using DOI in the context of IOMT?
– What is its use in explaining the phenomenon of diffusion before, during and after diffusion?
– Why other theories cannot explain in IOMT usage?
– What is that we do not know regarding applying DOI to explain usage of IOMT and how it can be extended to the concept of IOMT?

Regarding 1.5 pages
– definition of Task-technology fit (TTF) theory in terms of usage
– Advantages and disadvantages ( for each adv, disd needs references for each point you mention
– Is the model used currently if yes give example ( latest references 2017 ,2018, 2019 , 2020 ) journal and book only
– The use of model in healthcare practically about the usage if its useful for IOMT devices give examples ( latest references 2017 ,2018, 2019 , 2020 ) journal and book only.

Regarding 1.5 pages
– definition of (UTAUT model ) theory in terms of usage
– Advantages and disadvantages ( for each adv, disd needs references for each point you mention
– Is the model used currently if yes give example (latest references 2017 ,2018, 2019 , 2020 ) journal and book only
– The use of model in healthcare practically about the usage if its useful for IOMT devices give examples (latest references 2017 ,2018, 2019 , 2020 ) journal and book only.