Text and Data Mining valid from 2017-09-01
Received: 13 March 2017
Revised: 27 July 2017
Accepted: 21 August 2017
First Online: 1 September 2017
Compliance with ethical standards
: This manuscript is a report of two cases with a review of the literature. Research work with human and animal subjects was not conducted in preparation of this manuscript.
: The authors declare that they have no conflict of interest.