I might defer to Joel and Janice for some of the particulars, but what I can say that I think is helpful is that there's been a lot of work to define the particular elements. The World Health Organization has sort of done some work that has led to a minimal set of information to be included: the number of patients, those who withdrew from the trial, the different kinds of outcomes they are looking for in the trial, the design of the trials. There are ready-made lists that talk about the key pieces of information to be included under any system of clinical trial registration.
Perhaps Joel and Janice can describe some of the more particular pieces of information.