Keikkala, E., Koskinen, S., Vuorela, P., Laivuori, H., Romppanen, J., Heinonen, S., & Stenman, U. (2016). First trimester serum placental growth factor and hyperglycosylated human chorionic gonadotropin are associated with pre-eclampsia: A case control study. BMC Pregnancy Childbirth.

Keikkala, Elina, Sini Koskinen, Piia Vuorela, Hannele Laivuori, Jarkko Romppanen, Seppo Heinonen, a Ulf-Håkan Stenman. "First Trimester Serum Placental Growth Factor and Hyperglycosylated Human Chorionic Gonadotropin Are Associated With Pre-eclampsia: A Case Control Study." BMC Pregnancy Childbirth 2016.

Keikkala, Elina, et al. "First Trimester Serum Placental Growth Factor and Hyperglycosylated Human Chorionic Gonadotropin Are Associated With Pre-eclampsia: A Case Control Study." BMC Pregnancy Childbirth 2016.