Night Shift Nurses viewing order?

[sythspawn]

I could've sworn there was a thread about this already, but I couldn't find it, and my google-fu is proving weak today.

So far, I've got:
Night Shift Nurses
NSN: RN's Revenge
NSN: Clinical Confessions

What about the other stuff? What order should it be watched in?

[DocWatson]

I know this is very late, but as a start see "Ask John: How Much Night Shift Nurses Anime Exists?" and the ANN Encyclopedia's Night Shift Nurses (OAV) entry, which gives the relationships of the various series.