You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["AnatomicalEntity"].

Please return the output as a JSON object of the format: {"AnatomicalEntity": ["tumor cells", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Authors' contributions
OK and MG analyzed and interpreted the patient data regarding his hospitalization. SP and PK performed the coronary angiography, and were the major contributors in writing the manuscript. All authors read and approved the final manuscript.
{"AnatomicalEntity": ["coronary"]}