Complete blood count parameters as biomarkers of retinopathy of prematurity: a Portuguese multicenter study.

"Declarations Ethics approvalAll procedures performed in studies involving human participants were in accordance with the ethical standards of the Ethics Committee of Centro Hospitalar Universitário de Lisboa Norte and Centro Académico de Medicina de Lisboa (CAML), and Ethics Committees of all other participating hospital centers, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Written informed consent was obtained from the parents of all infants included in the study. This article does not contain any studies with animals performed by any of the authors. Conflict of interestThe authors (Mariza Fevereiro-Martins, Ana Carolina Santos, Carlos Marques-Neves, Hercília Guimarães, Manuel Bicho) declare no conflicts of interest. Mariza Fevereiro-Martins received a research fund from the company CUF and the Portuguese Society of Ophthalmology for the conduct of the present study. The funding body did not influence the design, data interpretation, or conclusions of this study. No proprietary interest is involved in any author of this manuscript. Conflict of interest The authors (Mariza Fevereiro-Martins, Ana Carolina Santos, Carlos Marques-Neves, Hercília Guimarães, Manuel Bicho) declare no conflicts of interest. Mariza Fevereiro-Martins received a research fund from the company CUF and the Portuguese Society of Ophthalmology for the conduct of the present study. The funding body did not influence the design, data interpretation, or conclusions of this study. No proprietary interest is involved in any author of this manuscript."

"Funding Open access funding provided by FCT|FCCN (b-on). This work was supported by the Laboratório de Genética and the Instituto de Saúde Ambiental (ISAMB) of the Faculdade de Medicina of Universidade de Lisboa and the Instituto de Investigação Científica Bento da Rocha Cabral. The writing of the manuscript was also supported by funds from Fundação para a Ciência e a Tecnologia to ISAMB (ref. UIDB/04295/2020 and UIDP/04295/2020). This work was also part of a doctoral project funding by the company CUF with a PhD grant in Medicine awarded in 2021 and by the Portuguese Society of Ophthalmology with a PhD grant awarded in 2019. The funding organizations had no role in the design, interpretation of data, or conclusions of this research."

"This is a multicenter, prospective, observational, and analytical study based on a Portuguese cohort from 8 neonatal intensive care units (Centro Hospitalar Universitário de Lisboa Norte, Hospital Prof. Doutor Fernando Fonseca, Centro Hospitalar Universitário de São João, Centro Materno Infantil do Norte belonging to the Centro Hospitalar Universitário do Porto, Hospital de Braga, Hospital da Senhora da Oliveira—Guimarães, Maternidade Bissaya Barreto, and Maternidade Daniel de Matos belonging to the Centro Hospitalar Universitário de Coimbra). This is a registered observational study (ISRCTN16889608)."