TY  - RPRT
TI  - Should we cross off the crossover?
AU  - P Armitage
PY  - 1991
DO  - 10.1111/j.1365-2125.1991.tb05604.x
UR  - https://pubmed.ncbi.nlm.nih.gov/1888627/
ID  - 1888627
ER  -