Intensity of metastasis screening and survival outcomes in patients with breast cancer oleh Jong-Ho Cheun, Jigwang Jung, Eun-Shin Lee, Jiyoung Rhu, Han-Byoel Lee, Kyung-Hun Lee, Tae-Yong Kim, Wonshink Han, Seock-Ah Im, Dong-Young Noh, Hyeong-Gon Moon