Cross landmines campaign. From 7 to 10 August 1997, just days before her death, she visited Bosnia and Herzegovina with Jerry White and Ken Rutherford of the Landmine Survivors Network. Her work on the landmines issue has been described as influential in the signing of the Ottawa Treaty, which created an international ban on the use of anti-personnel landmines. Introducing the Second Reading of the Landmines Bill 1998 to the British House of Commons, the Foreign Secretary, Robin Cook, paid tribute to Diana's work on landmines:All Honourable Members will be aware from their postbags of the immense contribution made by Diana, Princess of Wales to bringing home to many of our constituents the human costs of landmines. The best way in which to record our appreciation of her work, and the work of NGOs that have campaigned against landmines, is to pass the Bill, and to pave the way towards a global ban on landmines. A few months after Diana's death in 1997, the International Campaign to Ban Landmines won the Nobel Peace Prize. Cancer For her first solo official trip, Diana visited The Royal Marsden NHS Foundation Trust, a cancer treatment hospital in London. She later chose this charity to be among the organisations that benefited from the auction of her clothes in New York. The trust's communications manager said she did "much to remove the stigma and taboo associated with diseases such as cancer, AIDS, HIV and leprosy". Diana became president of the hospital on 27 June 1989. The Wolfson Children's Cancer Unit was opened by Diana on 25 February 1993. In February 1996, Diana, who had been informed about a newly opened cancer hospital built by Imran Khan, travelled to Pakistan to visit its children's cancer wards and attend a fundraising dinner in aid of the charity in Lahore. She later visited the hospital again in May 1997. In June 1996, she travelled to Chicago in her capacity as president of the Royal Marsden Hospital in order to attend a fundraising event at the Field Museum of Natural History and raised more than £1 million for cancer research. She additionally visited patients at the Cook County Hospital and delivered remarks at a conference on breast cancer at the Northwestern University Pritzker School of Law after meeting a group of breast cancer researchers. In September 1996, after being asked by Katharine Graham, Diana went to Washington and appeared