https://scholar.google.com/scholar_lookup?title=Prevalence+of+Erosive+Tooth+Wear+and+Associated+Risk+Factors+in+2–7-Year-Old+German+Kindergarten+Children&author=Wiegand,+A.&author=Müller,+J.&author=Werner,+C.&author=Attin,+T.&publication_year=2006&journal=Oral+Dis.&volume=12&pages=117–124&doi=10.1111/j.1601-0825.2005.01167.x