ACKNOWLEDGEMENTS
The authors are grateful to all participants and their attending obstetricians, nurses, midwives and laboratory technicians at all participating hospitals for facilitating the performance of this study. We are also grateful to Dr Santiago Valor, CMO at Synlab International GmbH, for his contribution in the execution of the study and valuable comments. This study is part of the PhD thesis of Dr Rayo. To all collaborators: Anna Suy, department of Obstetrics, Hospital Universitari Vall d’Hebron, Barcelona. Maria de la Calle, department of Obstetrics, Hospital Universitario La Paz, Madrid. Juan Luis Delgado, department of Obstetrics, Hospital Virgen de la Arrixaca, Murcia. Leire Rodriguez, department of Obstetrics, Hospital Universitario Cruces, Barakaldo. Sara Ruiz-Martínez, department of Obstetrics, Hospital Clínico Universitario Lozano Blesa, Zaragoza. Francisca Sonia Molina, department of Obstetrics, San Cecilio University Hospital, Instituto de Investigación Biosanitaria (IBS), Granada. Vicente Diago, department of Obstetrics, Hospital Universitario La Fe, Valencia. Adriana Aquise, department of Obstetrics, Hospital Universitario de Torrejón, Madrid. On behalf of the Gesta-COVID19 Collaboration Group. Mónica García Alvarez, department of clinical microbiology at Synlab Madrid. Miriam Sanchez Tudela, department of andrology laboratory, Hospital Universitario de Torrejón.
T. Ma, F. N. Yu, Queen Elizabeth Hospital, Hong Kong SAR, China. C. W. Kong, United Christian Hospital, Hong Kong SAR, China. T. K. Lo, Princess Margaret Hospital, Hong Kong SAR, China. P. L. So, Tuen Mun Hospital, Hong Kong SAR, China, W. C. Leung, Kwong Wah Hospital, Hong Kong SAR, China. W. Shu, Pamela Youde Nethersole Eastern Hospital, Hong Kong SAR, China; K. W. Cheung, Queen Mary Hospital, Hong Kong SAR, China. S. Moungmaithong, The Chinese University of Hong Kong, Hong Kong SAR, China. On behalf of the Chinese University of Hong Kong COVID-19 collaborative network.