The quote from the article says:
No serious scientific study has been able to establish that electrosensitivity exists ....
There are literally thousands of studies that have confirmed that electromagnetic hypersensitivity (EHS) exists. The intra-cellular mechanism has been discovered independently by different research teams composed of credited scientists in the field at major well-regarded universities in different parts of the globe.
But of course, a study about something that does not exist can not be "serious", now can it?
Here are the search terms to google for: Voltage-Gated Calcium Canals (VGCC), NO-ONOO cycle.
There are a couple of very good videos about it on Youtube, by professor Martin Pall. I very much recommend them, especially how he debunks earlier studies that had claimed that electrosensitivity wouldn't exist.
BTW, 40 people are nothing. The associations for people with electrohypersensitive disorders have thousands of members that would love to move to a town like Green Bank.