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Anonymizing Health Data by Luk Arbuckle, Khaled El Emam

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Preface

Although there is plenty of research into the areas of anonymization (masking and de-identification), there isn’t much in the way of practical guides. As we tackled one anonymization project after another, we got to thinking that more of this information should be shared with the broader public. Not an academic treatise, but something readable that was both approachable and applicable. What better publisher, we thought, than O’Reilly, known for their fun technical books on how to get things done? Thus the idea of an anonymization book of case studies and methods was born. (After we convinced O’Reilly to come along for the ride, the next step was to convince our respective wives and kids to put up with us for the duration of this endeavor.)

Audience

Everyone working with health data, and anyone interested in privacy in general, could benefit from reading at least the first couple of chapters of this book. Hopefully by that point the reader will be caught in our net, like a school of Atlantic herring, and be interested in reading the entire volume! We’ve identified four stakeholders that are likely to be specifically interested in this work:

  • Executive management looking to create new revenue streams from data assets, but with concerns about releasing identifiable information and potentially running afoul of the law
  • IT professionals that are hesitant to implement data anonymization solutions due to integration and usability concerns
  • Data managers and analysts that are unsure about their current methods of anonymizing data and whether they’re compliant with regulations and best practices
  • Privacy and compliance professionals that need to implement defensible and efficient anonymization practices that are pursuant with the HIPAA Privacy Rule when disclosing sensitive health data

Conventions Used in this Book

The following typographical conventions are used in this book:

Italic
Used for emphasis, new terms, and URLs.

Tip

This element signifies a tip, suggestion, or a general note.

Warning

This element indicates a trap or pitfall to watch out for, typically something that isn’t immediately obvious.

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Acknowledgements

Everything accomplished in this book, and in our anonymization work in general, would not have been possible without the great teams we work with at the Electronic Health Information Lab at the CHEO Research Institute, and Privacy Analytics, Inc. As the saying goes, surround yourself with great people and great things will come of it. A few specific contributions to this book are worth a high five: Ben Eze and his team of merry developers that put code to work; Andrew Baker, an expert in algorithms, for his help with covering designs and geoproxy risk; Abdulaziz Dahir, a stats co-op, who helped us with some of the geospatial analysis; and Youssef Kadri, an expert in natural language processing, for helping us with text anonymization.

Of course, a book of case studies wouldn’t be possible without data sets to work with. So we need to thank the many people we have worked with to anonymize the data sets discussed in this book: BORN Ontario (Ann Sprague and her team), the Health Care Cost and Utilization Project, Heritage Provider Network (Jonathan Gluck) and Kaggle (Jeremy Howard and team, who helped organize the Heritage Health Prize), the Clinical Center of Excellence at Mount Sinai (Lori Stevenson and her team, in particular Cornelia Dellenbaugh, sadly deceased and sorely missed), Informatics for Integrating Biology and the Bedside (i2b2), the State of Louisiana (Lucas Tramontozzi , Amy Legendre, and everyone else that helped) and organizers of the Cajun Code Fest, and the American Society of Clinical Oncology (Joshua Mann and Andrej Kolacevski).

Finally, thanks to the poor souls who slogged through our original work, catching typos and helping to clarify a lot of the text and ideas in this book: Andy Oram, technical editor extraordinaire; Jean-Louis Tambay, an expert statistician with a great eye for detail; Bradley Malin, a leading researcher in health information privacy; David Paton, an expert methodologist in clinical standards for health information; and Darren Lacey, an expert in information security. It’s no exaggeration to say that we had great people review this book! We consider ourselves fortunate to have received their valuable feedback.

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