Association between long-term use of calcium channel blockers (CCB) and the risk of breast cancer: a retrospective longitudinal observational study protocol by Christopher M Reid, Rachael Moorin, Sallie-Anne Pearson, Max K Bulsara, David B Preen, Gita Mishra, David Youens, Jeffery David Hughes, Ninh Thi Ha, Bruno H Stricker, Rikje Ruiter, Cameron Wright, Chau Ho, Walter P Abhayaratna, Christobel M Saunders, Frank J A van Rooij

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