Letter from Dr P. E. Hewitt National Blood Transfusion Service to Dr H. H. Gunson NBTS North Western RHA re Posttransfusion Hepatitis B PTHB Report Summary for North London Blood Transfusion Centre 19861989.
Letter from Dr P. E. Hewitt National Blood Transfusion Service to Dr H. H. Gunson NBTS North Western RHA re Posttransfusion Hepatitis B PTHB Report Summary for North London Blood Transfusion Centre 19861989.