Funding for this research was provided by:
DS was support by the generosity of Paula and Rusty Walter and Walter Oil & Gas Corp.
GT was supported by the Leonardo da Vinci 2019 fellowship from The Conference of Italian University Rectors and the Ministry of Education, University and Research (Italy).
Received: 26 March 2020
Revised: 4 June 2020
Accepted: 9 June 2020
First Online: 23 June 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.