ある夢と数学の埋葬 : 陰と陽の鍵 /Aru yume to sūgaku no maisō : In to yan no kagi

Do self-checks. Do regular self-examinations of your breasts. Most partners are more than happy to help, not just because breast cancer is the most common cancer among women. The best time to examine your breasts is in the week after your period.