Submitted on: 16 January 2009.
Revised on: 25 February 2009.
Accepted on: 15 March 2009.
___________________ACTA PARASITOLOGICA---SPRINGER INT PUBL AG
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Submitted on: 16 April 2019.
Revised on: 10 June 2019.
Accepted on: 18 July 2019.
___________________ACTA PARASITOLOGICA---SPRINGER INT PUBL AG