Investigation of patent foramen ovale as a mechanism for brain metastasis in patients without prior lung involvement. - Levin-Epstein R; Kumar P; Rusheen J; Fleming RG; McWatters Z; Kim W; Kaprealian TB; West B; Tobis JM (Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico, 2021)