Case
A letter was sent to the magazine with detailed information about the case. The authors were from Japan. After peer review and revision, the case report was accepted and acknowledgment was sent to the authors. Then two anonymous letters were received, both from Japan. Both letters claimed that the author "values ​​honor above all else" and that he had provided "ridiculous data".

COPE Advice
The editor advised writing to the author and his department manager to ask if they had any concerns, citing a similar experience previously submitted to COPE where an anonymous complaint was upheld.

Source: https://entc.com.ua/uk/2031-anonimnyi-krytyk