| Disagreement |
| Example 1 (Interpretation claim): The original article compared the number of OBGYN papers in a country-by-country manner and thereby ranked countries. The Letter claimed that other factors including gross national products or the country’s population should be considered.☆ |
| Agreement |
| Example 2 (Significance addition): An original article showed the efficacy and safety of ferric carboxymaltose for the treatment of anemic pregnant women. The Letter claimed that the vital parameters demonstrated here will detect hypersensitive reactions during iron infusion. |
| Example 3 (Data addition): An original article showed surgical repair of non-scarred uterine rupture during pregnancy. The Letter added a similar experience, which supports this strategy. |
| Complementary |
| Example 4 (Interpretation difference): The original article showed a case of asymptomatic uterine rupture. The Letter interprets such cases under the concept of “masked uterine rupture.”☆☆ |
| Example 5 (Historical viewpoint): The original article showed a new procedure of uterine compression suture in which the thread is removed after hemostasis. The Letter summarizes the research history of “removable” compression sutures. |
| Example 6 (Future looking): The original article demonstrated that “cold” relieved mothers’ pain during the amniocentesis procedure. The Letter proposed to study the cold effect on the fetal side. |
| Example 7 (Complementary, Interpretation difference, JMA Journal): The original article claimed the importance of educating trainees to write case reports. The Letter suggested that senior doctors should write case reports depending on the situation, a complementary viewpoint. |
