Spontaneous Heterotopic Pregnancy with Unaffected Intrauterine Pregnancy: Systematic Review of Clinical Outcomes oleh Mihaela Oancea, Razvan Ciortea, Doru Diculescu, Alexandra-Andreea Poienar, Mihaela Grigore, Roxana-Adelina Lupean, Renata Nicula, Diana Chira, Stefan Strilciuc, Dan Mihu