A Newark, Calif., woman and her husband sued drugmaker Bayer in federal court in San Francisco on Monday, saying she suffered a debilitating stroke after taking the company’s popular birth control pill Yaz for a month.

Her lawyer, Michael Danko, says he and co-counsel firm Girard Gibbs filed a similar suit last week and are preparing to file more. Hundreds of such suits filed around the country by Danko and other lawyers in the past month or so are just “the tip of the iceberg,” triggered by the publication of two recent studies published in the BMJ, a British medical journal, added Danko, of The Danko Law Firm in San Mateo, Calif.