Please choose the correct ending to complete the given sentence: Health: [header] How to understand hormone replacement therapy [title] Know the major types of hormone replacement therapy or hrt. [step] Progesterone and estrogen are two widely used medications for hormone replacement. [substeps] Progesterone and estrogen combined therapy is used during the perimenopause or phase one of menopause.

Ending1: Progesterone " only " therapy can be used by women who have their uterus. Estrogen " only " therapy is used by women that had a hysterectomy or removal of the uterus. Ending2: Estrogen is taken during the first two weeks of menopause and estrogen is taken at the end of the final week of puberty. During hormone replacement therapy, significant amounts of estrogen is still present in the body. Ending3: It aims to control estrogen and inhibit the production of progesterone. Androgenic hormone replacement therapy involves reducing hormone levels with hrt. Ending4: Estrogen is needed for the well-being of the body cells and stimulates testosterone production. Estrogen and estrogen combined therapy (also called hrt) is used during this form of therapy.

Answer format: ending1/ending2/ending3/ending4