All of those links are for the same book from 2015 (the fourth isn't direct to the relevant article but it's easy to find on the page). Has there been any new information since then?
The 50 studies in the cited 2015 book ought to span a range of time, and their keywords could be used to search literature for more recent material.
> Has there been any new information since then?
Since you asked, there apparently was a 2017 followup book by the same author. These links are for that book:
https://harvoa.org/chs/pr/dusbk2.htm
https://www.amazon.com/Ultrasound-Causation-Microcephaly-Vir...
https://www.goodreads.com/book/show/36466945-ultrasound-caus...
The 50 studies in the cited 2015 book ought to span a range of time, and their keywords could be used to search literature for more recent material.
> Has there been any new information since then?
Since you asked, there apparently was a 2017 followup book by the same author. These links are for that book:
https://harvoa.org/chs/pr/dusbk2.htm
https://www.amazon.com/Ultrasound-Causation-Microcephaly-Vir...
https://www.goodreads.com/book/show/36466945-ultrasound-caus...