In the present study all endpoints will be evaluated by descriptive methods. All variables will be presented as aggregated data. Categorical variables will be summarized in frequency tables (presenting frequencies and proportions) by type of anesthesia. The quantitative variables will be summarized by number of observations (n), mean, standard deviation (SD), median, minimum (min) and maximum (max) by anesthesia. If applicable, separate summaries will be presented for patients receiving one, two or more anesthesia, as well as pooled summaries. Graphical methods may be used wherever it is regarded as appropriate.