Has the reporting quality of published randomised controlled trial protocols improved since the SPIRIT statement? A methodological study von Tan, Zet Wei, Tan, Aidan Christopher, Li, Tom, Harris, Ian, Naylor, Justine M, Siebelt, Michiel, van Tiel, Jasper, Pinheiro, Marina, Harris, Laura, Chamberlain, Kira, Adie, Sam

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