Chatbots. Facial recognition. Artificial intelligence. These days, marketing feels less like Mad Men and more like the handiwork of mad scientists. Our connected gizmos vacuum up data so marketers can target us with eerie precision. Am I the only one who doesn't want my TV watching me? Alas, I digress.

In a world that increasingly resembles Minority Report, an old-school marketing technology still reigns supreme. You guessed it. I'm talking about email. According to a survey of US marketers conducted by the Direct Marketing Association (DMA) and Demand Metric, the median ROI of email marketing is 122%.

No where else have consumers become more accustomed to a customized experience than in healthcare. Each of us carries a unique medical history and physical makeup, so we don’t expect a one-size-fits-all approach.