@article{doi:10.1001/jama.1909.25420430001001,
author = {PORTER WT},
title = {THe critical periods in the life of a physician},
journal = {Journal of the American Medical Association},
volume = {LII},
number = {17},
pages = {1305-1307},
year = {1909},
doi = {10.1001/jama.1909.25420430001001},
URL = { + http://dx.doi.org/10.1001/jama.1909.25420430001001},
eprint = {/data/Journals/JAMA/10292/jama_LII_17_001.pdf}
}