Rana S, Schnettler WT, Powe C, Wenger J, Salahuddin S, Cerdeira AS, Verlohren S, Perschel FH, Arany Z, Lim KH, Thadhani R, Karumanchi SA. Clinical characterization and outcomes of preeclampsia with normal angiogenic profile. Hypertens Pregnancy. 2013 May; 32(2):189-201.