“…In the production phase of LSR, most of the LSRs registered 16–22 , 25 , 26 , 28–33 , 35 , 37 , 39–42 , 45–62 , 65–67 , 69–73 , 76–79 (81.2%) and wrote the protocol 16–35 , 37 , 39–43 , 45–67 , 69–73 , 76–79 (92.2%) before the study started. Less than one third of the LSRs searched the Chinese database 16–18 , 23 , 25 , 34 , 35 , 43 , 46 , 48 , 57 , 62–64 , 70 , 79 (25%), and less than half of the LSRs searched the preprint database 16 , 20 , 21 , 23–26 , 28 , 37 , 39 , 40 , 43 , 45 , 46 , 48 , 51 , 53 , 57 , 62–64 , 67 , 68 , 73 , 76 , 77 , 79 (42.2%), and two-thirds of the LSRs searched 12 COVID-19 databases 16 , 17 , 20–23 , 27 , 30 , 32 , 33 , 37–42 , 44–46 , 48 , 49 ...…”