led to the introduction
... that controversies related to the human experimentation in the United States led to the introduction of the institutional review boards?
... that controversies related to the <a class="mw-redirect" href="./Human_experimentation_in_the_United_States" id="mwBzQ" rel="mw:WikiLink" title="Human experimentation in the United States">human experimentation in the United States</a> <b id="mwBzU"><a href="./Human_subject_research_legislation_in_the_United_States" id="mwBzY" rel="mw:WikiLink" title="Human subject research legislation in the United States">led to the introduction</a></b> of the <a href="./Institutional_review_board" id="mwBzc" rel="mw:WikiLink" title="Institutional review board">institutional review boards</a>?