Letters published in the Postgraduate Medical Journal over an 18 month period
| All letters published in the Postgraduate Medical Journal over an 18 month period from January 2003 were reviewed. One author published three letters during this period. | |
| Letters published during period | 18 |
| Authors | 27 |
| Letters with one author | 12 |
| Total references quoted in letters | 73 |
| Letters in which authors quoted themselves | 8 |
| Single author letters in which author quoted his or her own work | 6 |
| References where authors cited themselves | 12 |
| Citations in full papers | 5 |
| Citations of their own letters | 7 |