TY  - RPRT
TI  - Differences between crossover and parallel study designs--debate?
AU  - S Daya
PY  - 1999
DO  - 10.1016/s0015-0282(98)00495-6
UR  - https://pubmed.ncbi.nlm.nih.gov/10202896/
ID  - 10202896
ER  -