我正在写论文，缩进有问题。下面段落的第一行超出了边距，我不明白为什么。这是代码：
\documentclass[12pt]{report}
\usepackage[left=35mm, right=25mm, top=30mm, bottom=30mm]{geometry}
\usepackage{graphicx}
\usepackage{multirow}
\usepackage{indentfirst} % Used to indent also the first paragraph (usually not indented in english)
\usepackage{mathptmx} % Used to simulate the use of Times New Roman
% If you want to use Arial, you have to use the following package
% \usepackage{helvet}
% \renewcommand{\familydefault}{\sfdefault}
\usepackage{textcomp}
\begin{document}
\author{}
\tableofcontents
\subsection{\fontsize{13}{16}\selectfont Maternal Medical Complications}
\subsubsection{\fontsize{12}{16}\selectfont Diabetic retinopathy}
The majority of women with diabetic retinopathy will not experience worsening of retinopathy in or following pregnancy. However, for some, particularly those with proliferative retinopathy (marked by new retinal vessel growth), retinopathy may worsen during pregnancy (``transient worsening") because of pregnancy-related vascular and volume changes. For a small subset of women with severe pregestational retinopathy, visual changes may persist post-delivery. The likelihood of retinopathy progression is related to maternal duration of diabetes, presence and severity of existing retinopathy, and to the degree of glycemic control prior to and during pregnancy. Hypertension, smoking, hyperlipidemia, and hypoglycemia have also been associated with acceleration of retinopathy in pregnancy.
\end{document}
结果如下：
您可以看到“视网膜病变”一词超出了右边距。
这是时代字体的问题吗？
提前致谢