This internet site is compiled from publications I have read, communications with other researchers and my own research. The information is provided as is in a good scientific manner to share knowledge. Where possible, I have mentioned the source of the information.

There is no warranty the data in the website is accurate and up to date. I can accept no responsibility for loss or damage, whether real or consequential, arising from its use.

If you think I violated some rule or just forgot a reference, then contact me and I will add a correction.

You may use this information for your own research purposes, and a reference to this site is welcomed. You may copy the text, tables and figures as long as you keep them intact. It is not allowed to use the information or parts of it for commercial purposes.

To cite the sprpages please use one of the following:

• From sprpages (www.sprpages.nl; accessed [date])

or


• From sprpages (www.sprpages.nl/url-to-page; accessed [date])

or


• Figures courtesy of Arnoud Marquart (www.sprpages.nl)