机译:Long-Term Variability in Immunofluorescence Titer of Antibodies to Nuclear Antigens Observed in Clinical Laboratory Proficiency Testing Surveys
Univ Washington, Dept Lab Med & Pathol, Seattle, WA 98195 USA;
Coll Amer Pathologists, Lab Improvement Programs, Northfield, IL USA;
Univ Minnesota, Dept Lab Med & Pathol, Minneapolis, MN 55455 USA;