While watching various videos, thanks to references this week from Fiona, Mary and Paul, came across the YouTube video...
MPN Horizons 2017 MPN 101 session CBC reading Dr. Martin Ellis
Recommend this video for MPN'ers who want to get a more in depth understanding of what a classic MPN actually is. It is rather long at 96 minutes. If you enjoyed science at school, you will love this video. I have watched it twice as it was so well presented.