We recommended a 3-stage study. In the first stage, we conducted a telephone audit of all 151 registered transplant hospitals in China to understand the size of the market. We reviewed findings and sorted hospitals by a) number of procedures b) hospital tier and c) city tier. In stage 2 we carried out qualitative IDIs to assess face to face quantitative study with physicians. It is possible to conduct interviews online but panels are still in development so therefore this method was more cost-effective.
This 3-stage appraoch allowed us to understand the universe in detail and from there design an accurate sample frame to reflect the whole of urban China. This in turn allowed us to produce a very accurate picture by city and hospital tier of likely uptake.