Availability by appointment, less chances w/o

I will not be as much in office as one could hope - I've got an issue with my back, and have been ordered to spend less time in the chair and more walking. 
If you send an e-mail I can easily be in office by appointment, but the chance of finding me by just knocking my door are somewhat reduced. 

AND: this in particular goes out to those of you for whom the 27th was inconvenient. Please send me an e-mail!

- Nils