TY  - RPRT
TI  - Old letters, new rules.
AU  - James Bradley Summers
AU  - Joseph Kaminski
PY  - 2003
DO  - 10.1016/s0140-6736(03)12591-3
UR  - https://pubmed.ncbi.nlm.nih.gov/12606204/
ID  - 12606204
ER  -