Hi,
What does the "hold" mean?
About 15 to 20 percent of people experience what physicians call functional dyspepsia, or persistent or recurring pain in the upper abdomen. Researchers like Pasricha have long noted that these people are also more likely than their peers to be anxious or depressed. Conventional wisdom has held that stress hormones associated with a patient's altered mood were responsible for his or her digestive disturbances.
Does it mean "consider, think, believe"?
Thanks a lot
Yes
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.