Variables entered into these models will be those that may have d

Variables entered into these models will be those that may have directly affected the event, were clinically plausible and that occurred before the outcome event. They will be predefined and used to adjust the main explanatory buy Cabazitaxel variables irrespective of statistical outcome. Model fit and calibration will be tested. Ethics and dissemination Research ethics approval The proposed study will not affect clinical care and has therefore been classified as an audit of surgical care by the South East Scotland Research Ethics Service in Edinburgh, Scotland (see online supplement 2). However, the mechanisms for gaining permission to perform this study may vary from country to country and from hospital

to hospital. In many centres, this study may be considered as global audit or global service evaluation, and may not require formal ethical approval. In such cases, the primary audit standard will be that the postoperative mortality rate should not exceed 15%.6 7 9 Local investigators are expected to gain approval from the appropriate body, such as the local Clinical Audit or Research Department or Institutional Review Boards. If such institutions are unavailable, written permission should be provided from the Chief of Surgery or a supervising consultant/attending

physician. Local investigators will be solely responsible for ensuring they have followed correct mechanisms, and will be asked to confirm this when data are submitted. Data will be entered and stored via a secure online database and will not be analysed at the level of individual surgeon or hospital. All necessary precautions will be taken to ensure that individual surgeons, hospitals or countries will not be identified from the presented data. Patient consent is not deemed necessary and inclusion in the study will incur minimal risk to patients. Trial registration The study protocol has been registered with ClinicalTrials.gov public study

registry (Identifier: NCT02179112). The registration entry is available to view online: http://clinicaltrials.gov/ct2/show/record/NCT02179112 Dissemination of results We will endeavour to make the outcomes of this project available to all irrespective of access to academic resources. Depending on the availability of funding or fees waiver, we aim to publish the eventual results open-access. Additionally, data will be modified to ensure that individual Carfilzomib patients, hospitals or surgeons cannot be recognised and deposited in an open-access online data repository for others to analyse. The study outcomes will be disseminated to a range of stakeholders and study participants, and made available through the study website: http://globalsurg.org/ Discussion In this study protocol, we outline a novel approach to collecting data on surgical outcomes worldwide.

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