How many women died in World War 1?

As a result of fighting or due to disease etc or just how many women died during 1914-1918?
The Russians had some women battalions and it is thought between 400-2000 died on the front line from both sides. The number raises more when you count civilian deaths from the war not directly to do with fighting but from shelling.

Some dressed as men to fight on the line, some were killed in civilian deaths and others whilst tending to the wounded, about 400 US nurses died mostly of Spanish Flu. Many others had to work in dangerous factories to quickly churn out the ammunition etc needed on the front line.

During 1914-1918 in the US alone over 25,000 women a year died in childbirth.