ResearchKit, the technology Apple ($AAPL) promises will transform the world's hundreds of millions of iPhones into handheld gatherers of clinical data, could become a viable tool in drug development, and two major drugmakers are working to integrated into clinical trials. As Buzzfeed reports, GlaxoSmithKline ($GSK) and Purdue Pharma are in the early stages of figuring out how to engage with ResearchKit. The platform is designed to allow medical institutions running clinical trials to design apps that keep tabs on patient-reported outcomes, measure vital signs or otherwise use the iPhone's many sensors to harvest information. The apps currently available measure symptoms of asthma, Parkinson's disease, diabetes, breast cancer and cardiovascular disease. More