Funding for this research was provided by:
Ocean Park Hong Kong
The Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, the Ministry of Education of China.
Received: 15 February 2018
Accepted: 26 December 2018
First Online: 3 January 2019
Ethics approval and consent to participate
: No living animal was used for this study. Samples were collected during the necropsy procedure. The research protocol was approved by the Animal Welfare and Ethics Committee of Ocean Park Hong Kong.
: Not applicable.
: The authors declare that they have no competing interests.
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