Serum cytokines in second trimester pregnancy and their relationship with spontaneous preterm births in the Ribeirão Preto and São Luiz cohorts - Turra, Suzana Eggers; Damaso, Enio Luis; Veiga, Eduardo Carvalho de Arruda; Cardoso, Viviane Cunha; Bettiol, Heloisa; Cavalli, Ricardo de Carvalho (BMC Pregnancy and Childbirth, 2023)