sham surgery
... that studies with sham surgery in humans have shown that treatments with cell transplants into the brains of patients with Parkinson disease were ineffective?
... that studies with <b id="mwFZ0"><a href="./Sham_surgery" id="mwFZ4" rel="mw:WikiLink" title="Sham surgery">sham surgery</a></b> in humans have shown that treatments with cell transplants into the <a href="./Brain" id="mwFZ8" rel="mw:WikiLink" title="Brain">brains</a> of patients with <a class="mw-redirect" href="./Parkinson_disease" id="mwFaA" rel="mw:WikiLink" title="Parkinson disease">Parkinson disease</a> were ineffective?