1.   If I answer no I simply return the questionnaire without any clinical data.

2.   If these data were combined with clinical data then large subgroups with low mortality could be identified.

3.   Clinical data of the patients studied are given in Table I.

4.   Clinical data were obtained from their medical histories.

5.   The table summarises the clinical data and results.

6.   Differences in criteria for symptoms and methods used to obtain clinical data cannot be ruled out.