Ultrasound during pregnancy- cause for concern?

I had a home birth and thought I was up on birthing naturally, but I recently came across an article about "ultrasound concerns", and if I choose to have another baby, I will think twice about this screening device.

The article mentions that left handedness in children who are supposed to be right-handed has been linked to ultra sound. Sounds like no big deal, I happen to like lefty's, but they are saying the reason they end up left handed is because of a subtle damage to the brain and males seem to be more affected than female fetuses, probably because the male brain develops later.

Studies also show the following abnormalities have been linked to ultrasound- Early labor, premature birth, miscarriage, increased learning disabilities and delayed speech development (these are just a few listed).