It was a shock hearing that Helen had passed away. She was involved in several international risk assessment projects that I also worked on in the last 10 years or so. Her knowledge and helpfulness were amazing. You could ask her about every rare, exotic disease. Although she was always very busy, she always found time to help. We did not often meet in person, but many times online during project meetings.She was always nice to everybody. My condolences to her familiy, friends and colleagues.