TY - RPRT TI - T and B lymphocytes during normal human pregnancy: a longitudinal study. AU - S A Birkeland AU - K Kristoffersen PY - 1979 DO - 10.1111/j.1365-3083.1979.tb01370.x UR - https://pubmed.ncbi.nlm.nih.gov/317536/ ID - 317536 ER -