TY - BOOK AU - Sakala, Elmar Peter (ed) TI - USMLE step 2 CK lecture notes 2022: obstetrics and gynecology SN - 9781506271224 PY - 2021/// CY - New York, NY PB - Kaplan Medical KW - GYNAECOLOGIC DISEASES KW - Obstetrics KW - CHILDBIRTH ER -