COVID-19 in Pregnancy and Early Childhood (COPE): study protocol for a prospective, multicentre biobank, survey and database cohort study oleh Anders Elfvin, Åsa Leijonhufvud, Sophia Brismar Wendel, Thomas Abrahamsson, Anna Wessberg, Helena Fadl, Maria Jonsson, Verena Sengpiel, Anna-Karin Wikström, Ulrika Aden, Ola Andersson, Lina Bergman, Marie Blomberg, Anna Sandström, Ylva Carlsson, Johanna Berg, Jan-Åke Liljeqvist, Mehreen Zaigham, Karolina Linden, Malin Veje, Hanna Östling, Anna Hagman, Anna Sand, Anna-Carin Wihlbäck, Elin Naurin, Emma Von Wowern, Gilda Dumitrescu, Gustaf Biasoletto, Johan Berg, Kathrin Rothbarth, Kristina Pettersson, Linda Hjertberg, Linda Iorizzo, Magnus Lindh, Maria Lindqvist, Maria Revelj, Maria Svenvik, Marie Vikström Bolin, Marie-Charlotte Nilsson, Matilda Friman Mathiasson, Merit Kullinger, Mirjana Janes-Nakic, Ove Karlsson, Pihla Kuusela, Sandra Holmström, Sofie Graner, Susanne Woxenius, Åsa Pontén