An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Cox J, Penn N, Masood M, Hancock AK, Parker D.Cox J, et al. Among authors: penn n.J R Soc Med. 1987 Nov;80(11):708-9. doi: 10.1177/014107688708001118.J R Soc Med. 1987.PMID: 3694619Free PMC article.No abstract available.
Griffiths AP, Penn ND, Tindall H.Griffiths AP, et al. Among authors: penn nd.Postgrad Med J. 1987 Jan;63(735):59-60. doi: 10.1136/pgmj.63.735.59.Postgrad Med J. 1987.PMID: 3671232Free PMC article.
Griffiths AP, Henderson M, Penn ND, Tindall H.Griffiths AP, et al. Among authors: penn nd.Postgrad Med J. 1988 Aug;64(754):617-20. doi: 10.1136/pgmj.64.754.617.Postgrad Med J. 1988.PMID: 3249709Free PMC article.
Tindall H, Griffiths AP, Penn ND.Tindall H, et al. Among authors: penn nd.Postgrad Med J. 1987 Oct;63(744):869-71. doi: 10.1136/pgmj.63.744.869.Postgrad Med J. 1987.PMID: 3447112Free PMC article.
Penn ND, Corrado OJ, Pitchfork LJ, Evans RT, Mascie-Taylor BH.Penn ND, et al.Postgrad Med J. 1989 Jan;65(759):20-1. doi: 10.1136/pgmj.65.759.20.Postgrad Med J. 1989.PMID: 2780447Free PMC article.