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:

[A decline in the French demographic situation in the context of a Europe also in demographic decline].
The author analyzes the decline in French fertility which has occurred over the past two years using data from official sources.  Some comparisons are made with fertility trends in other European countries.
{"AnatomicalEntity": []}