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.
Lowrie R, Morrison G, Lees R, Grant CH, Johnson C, MacLean F, Semple Y, Thomson A, Harrison H, Mullen AB, Lannigan N, Macdonald S.Lowrie R, et al. Among authors: johnson c.BMJ Open. 2015 Dec 30;5(12):e009180. doi: 10.1136/bmjopen-2015-009180.BMJ Open. 2015.PMID: 26719315Free PMC article.
Maskrey M, Johnson CF, Cormack J, Ryan M, Macdonald H.Maskrey M, et al.Br J Gen Pract. 2018 Oct;68(675):e735-e742. doi: 10.3399/bjgp18X699137.Br J Gen Pract. 2018.PMID: 30249610Free PMC article.
Bowers H, Kendrick T, van Ginneken N, Glowacka M, Williams S, Leydon GM, May C, Dowrick C, Moncrieff J, Johnson CF, Moore M, Laine R, Geraghty AWA.Bowers H, et al. Among authors: johnson cf.J Med Internet Res. 2021 Jul 16;23(7):e25537. doi: 10.2196/25537.J Med Internet Res. 2021.PMID: 34269688Free PMC article.