▁significantly ▁below ▁the ▁ 0 . 9 ▁percent ▁which ▁Imperial ▁College ▁of ▁the ▁UK ▁had ▁estimated , ▁or ▁the ▁ 0 . 6 6 ▁percent ▁found ▁in ▁a ▁re vised ▁study ▁last ▁week . ▁Several ▁exper ts ▁critic ized ▁that ▁the ▁He ins berg ▁study ▁had ▁been ▁made ▁public ▁initially ▁through ▁a ▁press ▁conference at ▁which ▁NR W ▁Minister ▁President ▁Ar min ▁Las ch et ▁was ▁also ▁present ▁– , ▁and ▁expressed ▁doub ts ▁about ▁the ▁method ▁of ▁statistical ▁sampling ▁used ▁in ▁the ▁study , ▁as ▁well ▁as ▁other ▁aspects . ▁▁ 1 3 – 1 9 ▁April ▁ ▁On ▁ 1 3 ▁April , ▁the ▁German ▁National ▁Academy ▁of ▁Sciences , ▁Leopold ina , ▁published ▁its ▁third ▁ad ▁h oc ▁statement ▁on ▁the ▁COVID - 1 9 ▁pan demic ▁in ▁Germany . ▁The ▁statement , ▁which ▁supp lement s ▁its ▁two ▁prede cess ors , ▁described ▁strateg ies ▁for ▁a ▁step wise ▁lif ting ▁or ▁modification ▁of ▁measures ▁against ▁the ▁pan demic , ▁taking ▁into ▁account ▁psych ological , ▁social , ▁legal , ▁ped agog ic ▁and ▁economic ▁aspects . ▁Re - open ing ▁of ▁class room ▁primary ▁and ▁lower - level ▁secondary ▁education ▁as ▁soon ▁as ▁feas ible , ▁with ▁observation ▁of ▁h yg iene ▁and ▁physical ▁dist ancing ▁measures , ▁was ▁recommended . ▁The ▁statement ▁did ▁not ▁contain ▁a ▁time frame ▁for ▁implementing ▁its ▁recommend ations . ▁Al ready ▁before ▁the ▁release ▁of ▁the ▁statement , ▁Chan cell or ▁Ang ela ▁Mer kel ▁said ▁that ▁the ▁recommend ations ▁of ▁the