N Engl J Med. 1981 Jun 04;304(23):1435. doi: 10.1056/NEJM198106043042328.
The New England journal of medicine
G D Vladutiu, A O Vladutiu
PMID: 7231474 DOI: 10.1056/NEJM198106043042328
[No abstract available.]
McCaffery M. Can Fam Physician. 1983 May;29:857. PMID: 21283356
McCaffery M. Can Fam Physician. 1983 Jun;29:1069. PMID: 21283292