Simplify the following text for a Grade 11 native English-speaking person.
Original: In the United Kingdom , the Society for Endocrinology and the British Society for Paediatric Endocrinology and Diabetes are the main professional organizations .
Simplified: Endocrinology is a part of medicine dealing with things wrong with any part of the endocrine system and hormones . Doctors who study endocrinology are called endocrinologists .