We are doing some essential maintenance work and you will not be able to register or update your profile setting until we've finished, which should be at about 9pm this evening.
We apologise for any inconvenience - you will be able to register shortly. In the mean time you will still be able to log in as usual.
Making participant-derived data available is not a panacea but, with careful support and management, it can improve reproducibility, says Jonathan Grigg
