TY  - RPRT
TI  - Invited commentary: old problem, new wrinkles.
AU  - J D Potter
PY  - 1998
DO  - 10.1093/oxfordjournals.aje.a009380
UR  - https://pubmed.ncbi.nlm.nih.gov/9596468/
ID  - 9596468
ER  -