使用R和knitr，我想将标题分为两行。我曾经能够用“\ n”做到这一点，但现在不行。
---
title: "DeKAF Cross Sectional Study:\nAnalysis of ptc, C4d, and DSA"
author: "L.G. Hunsicker"
date: '`r format(Sys.time(), "%d %B, %Y")`'
output:
pdf_document:
fig_width: 6
fig_height: 4
keep_tex: true
---
产生
DeKAF Cross Sectional Study Analysis of ptc, C4d, and
DSA
L.G. Hunsicker
27 August, 2017
现在知道如何拆分引用线？ Larry Hunsicker