Bark Collar Research Question

AJENSEN5831 asks: "I am writing a paper regarding the drawbacks to electronic bark collars. I work at a vet clinic, so I have seen several cases of irritated skin on the neck from bark collars and from invisible fence systems. Unfortunately, for an academic paper, I am required to produce written sources for my claims. Does anyone know of a written source (that is not a .com) that covers cases of hot spots in the neck area as a result of shock collars?"