I did a bit of research back in my undergrad/med school/residency days. The challenge with this study is not any different than any other population study. Specifically, how to deal the 'loss to follow up' group. I can remember spending countless evenings after calls calling up participants to make sure they come back so I can finish my paper. I am not about to call or email any of you back.
In the original spreadsheet, Troy developed a formula on one of his spreadsheets to add a calculated delivery date after 30 days if a user have not returned.
On this website version, I am polling the sites for the missing information. If I cannot verify that information, then that entry will be excluded from the study.
The same goes for pre 2/1/18 entries. That is the date we instituted the forms to enter data. Prior to that date, it was just a spreadsheet that any one can edit and alter. Some people tried to enter multiple entries. Some tried to edit and alter other people's entries. There were no way to police that so that set of data is not clean. The new form entry works very well, but, it also introduce a change in methodology. Consequently all data prior to that time cannot be included in the same current group. I've eliminated all those.
As far as collecting emails, that is a no go. The last thing I want is the responsibility of maintaining and protecting an email list; I just lost control of the entire data set.
We could just gently remind people to update their entry as they report their VIN or delivery.
CJ