1. The following rules shall apply in the following situations to the extent set out in this Article, insofar as they relate to persons not or no longer covered by Article 30:

(a) the following persons shall be covered by this Title for the purposes of reliance on and aggregation of periods of insurance, employment, self-employment or residence, including rights and obligations deriving from such periods in accordance with Regulation (EC) No 883/2004:

(i) Union citizens, as well as stateless persons and refugees residing in a Member State and nationals of third countries who fulfil the conditions of Regulation (EC) No 859/2003, who have been subject to the legislation of the United Kingdom before the end of the transition period, as well as their family members and survivors;

(ii) United Kingdom nationals, as well as stateless persons and refugees residing in the United Kingdom and nationals of third countries who fulfil the conditions of Regulation (EC) No 859/2003, who have been subject to the legislation of a Member State before the end of the transition period, as well as their family members and survivors;

for the purposes of the aggregation of periods, periods completed both before and after the end of the transition period shall be taken into account in accordance with Regulation (EC) No 883/2004;

(b) the rules set out in Articles 20 and 27 of Regulation (EC) No 883/2004 shall continue to apply to persons who, before the end of the transition period, had requested authorisation to receive a course of planned health care treatment pursuant to Regulation (EC) No 883/2004, until the end of the treatment. The corresponding reimbursement procedures shall also apply even after the treatment ends. Such persons and the accompanying persons shall enjoy the right to enter and exit the State of treatment in accordance with Article 14, mutatis mutandis;

(c) the rules set out in Articles 19 and 27 of Regulation (EC) No 883/2004 shall continue to apply to persons who are covered by Regulation (EC) No 883/2004 and who are on a stay at the end of the transition period in a Member State or the United Kingdom, until the end of their stay. The corresponding reimbursement procedures shall also apply even after the stay or treatment ends;

(d) the rules set out in Articles 67, 68 and 69 of Regulation (EC) No 883/2004 shall continue to apply, for as long as the conditions are fulfilled, to awards of family benefits to which there is entitlement at the end of the transition period for the following persons:

(i) Union citizens, stateless persons and refugees residing in a Member State as well as nationals of third countries who fulfil the conditions of Regulation (EC) No 859/2003 and reside in a Member State, who are subject to the legislation of a Member State and have family members residing in the United Kingdom at the end of the transition period;

(ii) United Kingdom nationals, as well as stateless persons and refugees residing in the United Kingdom and nationals of third countries who fulfil the conditions of Regulation (EC) No 859/2003 and reside in the United Kingdom, who are subject to the legislation of the United Kingdom and have family members residing in a Member State at the end of the transition period;

(e) in the situations set out in point (d)(i) and (ii) of this paragraph, for any persons who have rights as family members at the end of the transition period under Regulation (EC) No 883/2004, such as derived rights for sickness benefits in kind, that Regulation and the corresponding provisions of Regulation (EC) No 987/2009 shall continue to apply for as long as the conditions provided therein are fulfilled.

2. The provisions of Chapter 1 of Title III of Regulation (EC) No 883/2004 as regards sickness benefits shall apply to persons receiving benefits under point (a) of paragraph 1 of this Article.

This paragraph shall apply mutatis mutandis as regards family benefits based on Articles 67, 68 and 69 of Regulation (EC) No 883/2004.