@article{efc97c05f8534481ba9e397f189bd5f3,
title = "Incidence of venous thromboembolism in users of combined oral contraceptives (multiple letters)",
author = "H. Jick and Vandenbroucke, \{J. P.\} and Bloemenkamp, \{K. W.M.\} and Rosendaal, \{F. R.\} and Helmerhorst, \{F. M.\} and Lawrenson, \{R. A.\} and A. Whalley and E. Simpson and Farmer, \{R. D.T.\}",
year = "2000",
month = jan,
day = "1",
language = "English",
volume = "320",
pages = "57--58",
journal = "British Medical Journal",
issn = "0959-8146",
publisher = "BMJ Publishing Group",
number = "7226",
}