Additional Study Information: The COVID-19 Hematology, Oncology, Stem Cell Transplant (HOT) Consortium of Greater New York City is trying to learn more about the effects of COVID-19 on hemoglobinopathies, immunodeficiencies and cancer in children and young adults. Although exact studies for which the Research Database data may be used are not known at this time, the following are types of studies in which these data may be included are: 1) Studies to determine how well people recover from a COVID-19 infection, 2) Studies on how recovery after COVID-19 can be improved, 3) Studies to look at how various demographic and socioeconomic factors affect COVID-19 infection and recovery, 4) Studies to examine the effect of COVID-19 on other diagnoses, 5) Studies to determine if COVID-19 related delays to other planned treatment affected patients adversely.