- Correspondence to Dr Leon Robertson, 3551 S. Via de la Grulla Green Valley, AZ 85622 ,Phone: 520-812-1488 ;
- Received 3 April 2017
- Revised 11 June 2017
- Accepted 13 June 2017
- Published in print 25 July 2017.
- Published online 31 August 2017.
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