At the end of another year in pandemia, I wish to express my sincere gratitude, also on behalf of the other editors, the members of the editorial board and the publisher of the European Journal of Epidemiology, to the referees of the articles considered for the 2021 volume of EJE. Hundreds of busy colleagues have spent their time in assessing close to 2000 manuscripts submitted to our Journal, in selecting the ones that may possibly be published, and in improving the quality of the selected articles. All manuscripts considered for publication in EJE are peer-reviewed, also research letters, letters to the editor, and other forms of correspondence. Many of the reviewers have helped us in the past years as well, and we are tremendously appreciative and grateful to them [1,2,3]. It is largely thanks to them that EJE is doing well in attracting and publishing valuable contributions on epidemiologic research findings and epidemiologic methods.

Noraidatulakma Abdullah

Emma Accorsi

Sergio Acuna

Masoud Amiri

Therese Andersson

Hailey Banack

Mathias Basner

Andrew Beam

Ulrik Becker

Daniel Belsky

Ryan Benjamin

Klaus Berger

Raul Bescos

Lasse Bjerg

Jonas Björk

Anders Björkman

Jacques Blacher

Maria Blettner

Koen Bolhuis

Sarah Booth

Amber Boots

Daniel Bos

Julii Brainard

Tiffany Breger

Ellen Caniglia

Marianne Canonico

Svenja Caspers

Ida henriette Caspersen

Layal Chaker

Xiang-Yan Chen

Lori Chibnik

Nevio Cimolai

Pieter Coenen

Helen Coleman

Issa Dahabreh

George Davey Smith

Abbas Dehghan

Olaf Dekkers

Alexis Descatha

Hassan Dib

Barbra Dickerman

Elizabeth Diemer

Lisanne Dommershuijsen

Brian Earp

Matthias Egger

Orjan Ekblom

Helen Eke

Johan Engdahl

Daniel Escudero

Nadia Espejo-Herrera

Pam Factor-Litvak

Adeniyi Fagbamigbe

Tamás Ferenci

Pietro Ferrari

Anna Forsberg

Magda Gamba

Katalin Gemes

Peter Georgantopoulos

Madelon Geurtsen

Emilio Gianicolo

Polina Girchenko

Marija Glisic

Sergio Gómez Ochoa

Nadia Haddy

Christian Hakulinen

Mats Hallgren

William Hanage

Michael Hauptmann

Eleanor Hayes-Larson

Pontus Henriksson

Barbara Hoffmann

Albert Hofman

Bjorn Hofmann

David Hunter

Jennifer Hutcheon

Arfan Ikram

Gabriela Ilie

Maki Inoue-Choi

John Ioannidis

Geetha Iyer

Bengt Järvholm

Amit Joshi

Ulrich Keil

István Kenessey

Silke Kern

Ahmad Khosravi

Bernd Kowall

Eline Krijkamp

Carlo La Vecchia

Jeremy Labrecque

Klaus Langohr

Maarten Leening

Catherine Lesko

Andrew Levin

Silvan Licher

Yen Ting Lin

Marc Lipsitch

Chelsea Liu

Maja Lisa Løchen

Emily Walsh Lopes

Mojtaba Lotfalian

Anikó Lovik

Jacobus Lubsen

Zhehui Luo

Yan Ma

Yuan Ma

Lamberto Manzoli

Kathleen Martin

David McMillan

Suril Mehta

Christa Meisinger

Anna Mejldal

Marilyne Menassa

Michelle Mens

Richard Merrick

Hiltrud Merzenich

Gideon Meyerowitz-Katz

Alessandro Miani

Susanne Moebus

Ben Mol

Brian Morris

Taulant Muka

Androniki Naska

Julia Neitzel

Tom Nightingale

Georgios Nikolopoulos

Anton Nilsson

Katharina Nimptsch

Daniel Nuyujukian

Wilhelm Oberaigner

Jeewon Oh

Jørn Olsen

Chenwei Pan

Björn Pasternak

Roberta Pastorino

Yudi Pawitan

Neil Pearce

Judea Pearl

Annette Peters

Lucia Petito

Andreas Pettersson

Luisa Politano

Georgios Polychronidis

Chengxuan Qiu

Hamidreza Raeisi

Ramkripa Raghavan

Sridharan Raghavan

Aaron Reeves

Shay Reicher

Thomas Remer

Lorenzo Richiardi

Carlos Javier Riumallo Herl

Rubi Rodriquez-Diaz

Sabine Rohrmann

Paloma Rojas-Sannero

Dietrich Rothenbacher

Alexandra Rouquette

Sara Sammallahti

Susana Santos

Börge Schmidt

Peter Scholz-Kreisel

Catherine Mary Schooling

Sylvain Sebert

Kyla Shea

Joy Shi

Michal Shimonovich

Johannes Siegrist

Ingmar Skoog

David Soave

Huan Song

Mingyang Song

Carles Soriano-Mas

Mats Stensrud

Olof Stephansson

Alexander Stiby

Susanne Stolpe

S. V. Subramanian

Qi Sun

Jordi Sunyer

Sian Sweetland

Elisavet Syriopoulou

Henning Tiemeier

Kate Tilling

Ylva Trolle Lagerros

Hiroshi Ureshino

Nan van Geloven

Mieke van Hemelrijck

Frank van Rooij

Jan van der Meulen

Alexis Vanhaesebrouck

Kavita Venkataraman

Alina Vrieling

Rama Wahab

Alec Walker

Xiaobin Wang

Reem Waziry

Renate Winkels

Frank Wolters

Julia Wu

Canqing Yu

Loukas Zagkos

Ehsan Zereshki

Tonglin Zhang

Yan-Bo Zhang

Huiying Zhao

Ju-Sheng Zheng

Runyu Zou