8/13/2019 Postgrad Med J 1989 Crisp 150 5

1/7

http://group.bmj.com/http://pmj.bmj.com/

8/13/2019 Postgrad Med J 1989 Crisp 150 5

2/7

http://group.bmj.com/http://pmj.bmj.com/

8/13/2019 Postgrad Med J 1989 Crisp 150 5

3/7

http://group.bmj.com/http://pmj.bmj.com/

8/13/2019 Postgrad Med J 1989 Crisp 150 5

4/7

http://group.bmj.com/http://pmj.bmj.com/

8/13/2019 Postgrad Med J 1989 Crisp 150 5

5/7

http://group.bmj.com/http://pmj.bmj.com/

8/13/2019 Postgrad Med J 1989 Crisp 150 5

6/7

http://group.bmj.com/http://pmj.bmj.com/

8/13/2019 Postgrad Med J 1989 Crisp 150 5

7/7

http://group.bmj.com/http://pmj.bmj.com/http://group.bmj.com/subscribe/http://group.bmj.com/subscribe/http://journals.bmj.com/cgi/reprintformhttp://journals.bmj.com/cgi/reprintformhttp://group.bmj.com/group/rights-licensing/permissionshttp://group.bmj.com/group/rights-licensing/permissionshttp://pmj.bmj.com/content/65/761/150