PLOD1 and central precocious puberty: The clinical data (e.g., age at diagnosis, personal and family history of major diseases, family history of CPP), laboratory data (follicle-stimulating hormone (FSH), luteinizing hormone (LH), estradiol (E2) and gonadotropin releasing hormone (GnRH) stimulation test results), and radiological data including pelvic ultrasonography and bone age (BA) assessment were recorded.