PEN closed the door for new partners on 31. December 2007.
The project has more than achieved its targeted number of PEN studies. Moreover, in order to start the analysis of the global data set, a firm deadline has also been set for the submission of final data sets (end of 2008).
Students and researchers not directly linked to PEN are welcome to use the prototype questionnaire and guidelines in their own work and for non-commercial purposes. Due reference and acknowledgement should be made.