An article that was released in Febrtuary of 2002, stated that “A woman has more than five times the normal risk of developing endometriosis if her sister has the disease, according to research published today (Thursday 28 February) in Europe’s leading reproductive medicine journal, Human Reproduction*.”
The full article can be found at SciTecLibrary. (original article no longer available) – an alternative overview is here: https://www.decode.com/genetic-link-to-endometriosis-unique-icelandic-study-provides-further-proof/
I apologise for the delay in posting this article. I did have it saved in my file folder but things were very hectic at that time due to projects and midterms.