<https://www.colgate.com/es-cr/oral-health/dental-visits/why-your-dentist-might-use-a-rubber-dam>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.colgate.com/es-cr/oral-health/dental-visits/why-your-dentist-might-use-a-rubber-dam>