| 摘要 |
<p>A support assembly includes a deck (412) including an upper deck portion (414) and a central, longitudinal recess (456) in the upper deck portion (414), the recess (456) being defined by a lower deck portion (430) and walls connecting the lower and the upper deck portions (430, 414), and a mattress (550) resting on the deck (412), the mattress (550) including a generally planar, upwardly-facing support surface (552), side portions resting on the upper deck portions (414), and a central portion (576) extending downwardly into the recess (456).</p> |
