some resources you may want to use:

https://news.cornell.edu/stories/2018/10/using-smartphone-ca...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4950215/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6166694/

https://www.youtube.com/watch?v=AVQzu9AL3IU

https://www.researchgate.net/post/What_is_the_best_measure_t...