A writer does so not simply to display syntactical fluency, but to facilitate composition, comprehension, and concinnity.
Comprehension is facilitated when a reader is guided by an effective sentence pattern.
Concinnity is the bonus. There is poetry in quality medical writing. Space does not permit a comparable examination of phrases. After a brief presentation of grammatical characteristics, each syntactical structure will be examined as to its effectiveness for achieving the rhetorical intents cited above. Clarity is clarity.