Unfortunately the only way to get magic potions on Stein's world was to ask a witch, and the mortality rate from that was generally 100% unless you were useful as a tool. The doctor watched the other man through the lenses of his glasses, considering.

"It's a low rate," he said. "The procedure is quite routine. There are occasionally complications, and I haven't had an opportunity to examine your physiology, but I'd say the chances of anything happening are very low. Especially since we won't be in any rush with yours, so we can take our time and do things right."

He smiled. "I've never lost anyone on my surgical table, so have no fear."