Research article
An open-label, 1-year extension study of the long-term safety and efficacy of once-daily OROS® hydromorphone in patients with chronic cancer pain
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* Corresponding author: John Thipphawong JThippha@its.jnj.com
BMC Palliative Care 2009, 8:14 doi:10.1186/1472-684X-8-14
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