PGF and preeclampsia: The collected serum samples of the preeclampsia‐positive (n = 49) and preeclampsia‐negative (n = 147) patients were subjected to the following serum marker measurements: sFlt‐1; PlGF; PAPP‐A2; GlyFn; TM; tPAI‐C; complement factors C1q, B, and H; UA; BUN; Cre; and Cysc.