1.

Questionnaire.

1.

Detailed statistical analysis.

1.

Overview of datasources.

1.

Questionnaire responses.

1.

Detailed hospital characteristics.

1.

Detailed surgical procedures.

1.

Distribution of hospital uncorrected (non-parametric) DEA scores in proportion to the percentage of severe complications (output).

1.

Descriptive data on population level.

1.

Hospital characteristics representing input and output for DEA score.

1.

Results of truncated regression analysis.