Coding was carried out independently by two of the study authors (AG, JB) and coding discrepancies were resolved by discussion between the coders.
Focus group transcripts were independently reviewed by two of the study authors (JDP, MRF) to identify and code distinct themes.
During the study period, the counsellors were directly observed performing the tests on a weekly basis by one of the study authors (JMW).
"What's actually going on is that the sun is staying put in its fixed reference frame and it's the planetary orbits that are being tilted by Planet Nine," study co-author Konstantin Batygin, an assistant professor of planetary science at Caltech, told Astronomy magazine.
While most research on workplace games has concerned itself with spontaneous, employee-generated play, one forthcoming study — authored by Mollick, the Wharton professor, and his colleague Nancy Rothbard — is among the first to consider the effect on workers of "managerially imposed" exercises that mimic video games.
At follow-up, the vital status of study patients was ascertained by two authors for each study either by telephone interview with the patient or his/her relatives or by queries to the registry office of cities of residence.
The genes that showed fingerprints of natural selection were identified by two other authors of the study, Elinor K. Karlsson and Dr. Pardis C. Sabeti, computational biologists at Harvard, in the genomes of Bengalis, the majority population in Bangladesh.
The Spanish translation of the original questionnaire was performed and agreed by two bilingual authors of the study (EPC and JMGL) [See Additional file 1].
The quality of each included study was assessed by two review authors (ASDP, JW) using the QUality Assessment of Diagnostic Accuracy Studies (QUADAS-2) checklist [ 19, 20].
They were briefed for the purpose of this study by two of the authors (SA and KO).
