I am having a hard time getting good response ratios on my cold calling efforts to request 15-20 mins with clinical professionals for customer development interviews. Any tips /suggestions on how I can be more effective? I have tried emailing/LinkedIn General Physician and Specialist Nurses in my area of interest.
Consider going to a large professional society meeting. For instance, the RSNA in Chicago every year attracts thousands of radiologists. Other professional societies have similar large events. When there you can approach the professionals in person, try to attract them through Twitter or set-up an interview booth and offer them something for their time such as an invitation to a happy hour after the conference.